8049_b13d

Offspring phenotype	Predicted ratio	Observed
A–B–	9	165
A–bb	3	43
aaB–	3	42
aabb	1	6

You perform a dihybrid cross (AaBb × AaBb) and count the F₂ offspring phenotypes. Assume independent assortment and complete dominance.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions differ from 9:3:3:1. Incorrect The cross produces a 1:1:1:1 ratio, allowing for differences due to chance. Incorrect The cross's predicted offspring ratio changes with the sample size. Incorrect The cross produces a 9:3:3:1 ratio, allowing for differences due to chance. Correct MC

aa19_c73e

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	67
Recessive phenotype (aa)	1	25

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions follow 1:1; observed differences are due to chance. Incorrect The offspring proportions follow 3:1; observed differences are due to chance. Correct The offspring proportions differ from 3:1. Incorrect The offspring proportions follow 67:25; observed differences are due to chance. Incorrect MC

e444_95db

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	122
Recessive phenotype (aa)	1	38

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross produces a 3:1 ratio, allowing for differences due to chance. Correct The cross produces a 1:1 ratio, allowing for differences due to chance. Incorrect The cross produces an offspring ratio different from 3:1. Incorrect The cross's predicted offspring ratio changes with the sample size. Incorrect MC

e861_160b

Offspring phenotype	Predicted ratio	Observed
Red flowers (RR)	1	32
Pink flowers (Rr)	2	60
White flowers (rr)	1	28

In a plant species with incomplete dominance, you cross two pink individuals (Rr × Rr) and score flower color.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions follow 8:15:7; observed differences are due to chance. Incorrect The observed counts must be exactly 30:60:30, in the table's category order. Incorrect The offspring proportions follow 1:2:1; observed differences are due to chance. Correct The cross produces an offspring ratio different from 1:2:1. Incorrect MC

bb35_e07b

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	107
Recessive phenotype (aa)	1	41

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross produces a 3:1 ratio, allowing for differences due to chance. Correct The offspring proportions differ from 3:1. Incorrect The cross's predicted offspring ratio changes with the sample size. Incorrect The cross produces a 107:41 ratio, allowing for differences due to chance. Incorrect MC

d66e_29d1

Offspring phenotype	Predicted ratio	Observed
Red flowers (RR)	1	33
Pink flowers (Rr)	2	58
White flowers (rr)	1	29

In a plant species with incomplete dominance, you cross two pink individuals (Rr × Rr) and score flower color.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions follow 33:58:29; observed differences are due to chance. Incorrect The offspring proportions follow 1:2:1; observed differences are due to chance. Correct The offspring proportions differ from 1:2:1. Incorrect The cross's predicted offspring ratio changes with the sample size. Incorrect MC

b027_94b9

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	79
Recessive phenotype (aa)	1	25

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions follow 3:1; observed differences are due to chance. Correct The observed counts must be exactly 78:26, in the table's category order. Incorrect The offspring proportions follow 1:1; observed differences are due to chance. Incorrect The cross produces an offspring ratio different from 3:1. Incorrect MC

ea7e_12f9

Offspring phenotype	Predicted ratio	Observed
Red flowers (RR)	1	47
Pink flowers (Rr)	2	108
White flowers (rr)	1	57

In a plant species with incomplete dominance, you cross two pink individuals (Rr × Rr) and score flower color.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions differ from 1:2:1. Incorrect The observed counts must be exactly 53:106:53, in the table's category order. Incorrect The offspring proportions follow 1:2:1; observed differences are due to chance. Correct The offspring proportions follow 1:1:1; observed differences are due to chance. Incorrect MC

1245_1017

Offspring phenotype	Predicted ratio	Observed
Red flowers (RR)	1	41
Pink flowers (Rr)	2	90
White flowers (rr)	1	33

In a plant species with incomplete dominance, you cross two pink individuals (Rr × Rr) and score flower color.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions differ from 1:2:1. Incorrect The cross produces a 1:2:1 ratio, allowing for differences due to chance. Correct The cross's predicted offspring ratio changes with the sample size. Incorrect The cross produces a 41:90:33 ratio, allowing for differences due to chance. Incorrect MC

faab_9436

Offspring phenotype	Predicted ratio	Observed
Red flowers (RR)	1	56
Pink flowers (Rr)	2	83
White flowers (rr)	1	53

In a plant species with incomplete dominance, you cross two pink individuals (Rr × Rr) and score flower color.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross produces an offspring ratio different from 1:2:1. Incorrect The cross's predicted offspring ratio changes with the sample size. Incorrect The cross produces a 56:83:53 ratio, allowing for differences due to chance. Incorrect The cross produces a 1:2:1 ratio, allowing for differences due to chance. Correct MC

8564_504b

Offspring phenotype	Predicted ratio	Observed
A–B–	9	161
A–bb	3	50
aaB–	3	59
aabb	1	18

You perform a dihybrid cross (AaBb × AaBb) and count the F₂ offspring phenotypes. Assume independent assortment and complete dominance.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions differ from 9:3:3:1. Incorrect The observed counts must be exactly 162:54:54:18, in the table's category order. Incorrect The offspring proportions follow 1:1:1:1; observed differences are due to chance. Incorrect The offspring proportions follow 9:3:3:1; observed differences are due to chance. Correct MC

a363_1f08

Offspring phenotype	Predicted ratio	Observed
Red flowers (RR)	1	26
Pink flowers (Rr)	2	67
White flowers (rr)	1	39

In a plant species with incomplete dominance, you cross two pink individuals (Rr × Rr) and score flower color.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross produces an offspring ratio different from 1:2:1. Incorrect The offspring proportions follow 26:67:39; observed differences are due to chance. Incorrect The cross's predicted offspring ratio changes with the sample size. Incorrect The offspring proportions follow 1:2:1; observed differences are due to chance. Correct MC

8a39_7566

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	101
Recessive phenotype (aa)	1	43

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions follow 101:43; observed differences are due to chance. Incorrect The cross's predicted offspring ratio changes with the sample size. Incorrect The offspring proportions follow 3:1; observed differences are due to chance. Correct The cross produces an offspring ratio different from 3:1. Incorrect MC

71ee_63c2

Offspring phenotype	Predicted ratio	Observed
A–B–	9	164
A–bb	3	46
aaB–	3	61
aabb	1	17

You perform a dihybrid cross (AaBb × AaBb) and count the F₂ offspring phenotypes. Assume independent assortment and complete dominance.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross produces a 164:46:61:17 ratio, allowing for differences due to chance. Incorrect The cross produces a 1:1:1:1 ratio, allowing for differences due to chance. Incorrect The cross produces a 9:3:3:1 ratio, allowing for differences due to chance. Correct The offspring proportions differ from 9:3:3:1. Incorrect MC

e172_b24e

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	103
Recessive phenotype (aa)	1	37

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross produces an offspring ratio different from 3:1. Incorrect The offspring proportions follow 3:1; observed differences are due to chance. Correct The cross's predicted offspring ratio changes with the sample size. Incorrect The offspring proportions follow 103:37; observed differences are due to chance. Incorrect MC

c1e1_e389

Offspring phenotype	Predicted ratio	Observed
Red flowers (RR)	1	55
Pink flowers (Rr)	2	114
White flowers (rr)	1	59

In a plant species with incomplete dominance, you cross two pink individuals (Rr × Rr) and score flower color.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross produces a 55:114:59 ratio, allowing for differences due to chance. Incorrect The cross's predicted offspring ratio changes with the sample size. Incorrect The offspring proportions differ from 1:2:1. Incorrect The cross produces a 1:2:1 ratio, allowing for differences due to chance. Correct MC

473e_1607

Offspring phenotype	Predicted ratio	Observed
A–B–	1	80
A–bb	1	69
aaB–	1	82
aabb	1	69

You perform a dihybrid testcross (AaBb × aabb) and count the offspring phenotypes. Assume independent assortment and complete dominance.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions differ from 1:1:1:1. Incorrect The offspring proportions follow 80:69:82:69; observed differences are due to chance. Incorrect The offspring proportions follow 9:3:3:1; observed differences are due to chance. Incorrect The offspring proportions follow 1:1:1:1; observed differences are due to chance. Correct MC

95f5_acf9

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	79
Recessive phenotype (aa)	1	25

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross produces a 1:1 ratio, allowing for differences due to chance. Incorrect The cross produces a 79:25 ratio, allowing for differences due to chance. Incorrect The cross produces an offspring ratio different from 3:1. Incorrect The cross produces a 3:1 ratio, allowing for differences due to chance. Correct MC

09db_cee5

Offspring phenotype	Predicted ratio	Observed
A–B–	9	130
A–bb	3	39
aaB–	3	54
aabb	1	17

You perform a dihybrid cross (AaBb × AaBb) and count the F₂ offspring phenotypes. Assume independent assortment and complete dominance.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross's predicted offspring ratio changes with the sample size. Incorrect The offspring proportions follow 9:3:3:1; observed differences are due to chance. Correct The cross produces an offspring ratio different from 9:3:3:1. Incorrect The observed counts must be exactly 135:45:45:15, in the table's category order. Incorrect MC

a10b_10fa

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	119
Recessive phenotype (aa)	1	41

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions differ from 3:1. Incorrect The cross produces a 1:1 ratio, allowing for differences due to chance. Incorrect The cross produces a 119:41 ratio, allowing for differences due to chance. Incorrect The cross produces a 3:1 ratio, allowing for differences due to chance. Correct MC

4af7_4081

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	116
Recessive phenotype (aa)	1	44

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross produces a 3:1 ratio, allowing for differences due to chance. Correct The cross produces a 1:1 ratio, allowing for differences due to chance. Incorrect The cross produces a 29:11 ratio, allowing for differences due to chance. Incorrect The cross produces an offspring ratio different from 3:1. Incorrect MC

e19e_3d7b

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	70
Recessive phenotype (aa)	1	18

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions follow 3:1; observed differences are due to chance. Correct The cross produces an offspring ratio different from 3:1. Incorrect The observed counts must be exactly 66:22, in the table's category order. Incorrect The offspring proportions follow 1:1; observed differences are due to chance. Incorrect MC

6b5b_6465

Offspring phenotype	Predicted ratio	Observed
Red flowers (RR)	1	71
Pink flowers (Rr)	2	110
White flowers (rr)	1	55

In a plant species with incomplete dominance, you cross two pink individuals (Rr × Rr) and score flower color.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions differ from 1:2:1. Incorrect The cross produces a 71:110:55 ratio, allowing for differences due to chance. Incorrect The observed counts must be exactly 59:118:59, in the table's category order. Incorrect The cross produces a 1:2:1 ratio, allowing for differences due to chance. Correct MC

79ea_44c1

Offspring phenotype	Predicted ratio	Observed
A–B–	9	123
A–bb	3	44
aaB–	3	68
aabb	1	21

You perform a dihybrid cross (AaBb × AaBb) and count the F₂ offspring phenotypes. Assume independent assortment and complete dominance.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions differ from 9:3:3:1. Incorrect The observed counts must be exactly 144:48:48:16, in the table's category order. Incorrect The offspring proportions follow 123:44:68:21; observed differences are due to chance. Incorrect The offspring proportions follow 9:3:3:1; observed differences are due to chance. Correct MC

b0b6_06d3

Offspring phenotype	Predicted ratio	Observed
A–B–	9	147
A–bb	3	43
aaB–	3	43
aabb	1	7

You perform a dihybrid cross (AaBb × AaBb) and count the F₂ offspring phenotypes. Assume independent assortment and complete dominance.

Which statement is the null hypothesis (H₀) for this chi-square test?

The observed counts must be exactly 135:45:45:15, in the table's category order. Incorrect The offspring proportions follow 1:1:1:1; observed differences are due to chance. Incorrect The cross produces an offspring ratio different from 9:3:3:1. Incorrect The offspring proportions follow 9:3:3:1; observed differences are due to chance. Correct MC

47d5_64e2

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	99
Recessive phenotype (aa)	1	29

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions follow 3:1; observed differences are due to chance. Correct The cross's predicted offspring ratio changes with the sample size. Incorrect The cross produces an offspring ratio different from 3:1. Incorrect The observed counts must be exactly 96:32, in the table's category order. Incorrect MC

12ba_b8cc

Offspring phenotype	Predicted ratio	Observed
A–B–	9	170
A–bb	3	64
aaB–	3	72
aabb	1	14

You perform a dihybrid cross (AaBb × AaBb) and count the F₂ offspring phenotypes. Assume independent assortment and complete dominance.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions differ from 9:3:3:1. Incorrect The offspring proportions follow 9:3:3:1; observed differences are due to chance. Correct The offspring proportions follow 85:32:36:7; observed differences are due to chance. Incorrect The cross's predicted offspring ratio changes with the sample size. Incorrect MC

d7dc_cbd3

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	77
Recessive phenotype (aa)	1	23

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The observed counts must be exactly 75:25, in the table's category order. Incorrect The cross produces a 3:1 ratio, allowing for differences due to chance. Correct The offspring proportions differ from 3:1. Incorrect The cross produces a 1:1 ratio, allowing for differences due to chance. Incorrect MC

73ef_caf7

Offspring phenotype	Predicted ratio	Observed
A–B–	1	50
A–bb	1	53
aaB–	1	51
aabb	1	62

You perform a dihybrid testcross (AaBb × aabb) and count the offspring phenotypes. Assume independent assortment and complete dominance.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross's predicted offspring ratio changes with the sample size. Incorrect The offspring proportions differ from 1:1:1:1. Incorrect The offspring proportions follow 1:1:1:1; observed differences are due to chance. Correct The offspring proportions follow 50:53:51:62; observed differences are due to chance. Incorrect MC

838f_a58f

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	107
Recessive phenotype (aa)	1	33

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross produces a 107:33 ratio, allowing for differences due to chance. Incorrect The offspring proportions differ from 3:1. Incorrect The cross produces a 1:1 ratio, allowing for differences due to chance. Incorrect The cross produces a 3:1 ratio, allowing for differences due to chance. Correct MC

4ef8_f83d

Offspring phenotype	Predicted ratio	Observed
A–B–	9	187
A–bb	3	59
aaB–	3	42
aabb	1	16

You perform a dihybrid cross (AaBb × AaBb) and count the F₂ offspring phenotypes. Assume independent assortment and complete dominance.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions follow 9:3:3:1; observed differences are due to chance. Correct The cross's predicted offspring ratio changes with the sample size. Incorrect The cross produces an offspring ratio different from 9:3:3:1. Incorrect The offspring proportions follow 1:1:1:1; observed differences are due to chance. Incorrect MC

35b9_964a

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	106
Recessive phenotype (aa)	1	34

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross produces a 3:1 ratio, allowing for differences due to chance. Correct The cross produces a 53:17 ratio, allowing for differences due to chance. Incorrect The offspring proportions differ from 3:1. Incorrect The observed counts must be exactly 105:35, in the table's category order. Incorrect MC

101f_bdbc

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	99
Recessive phenotype (aa)	1	17

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross produces a 1:1 ratio, allowing for differences due to chance. Incorrect The offspring proportions differ from 3:1. Incorrect The cross produces a 99:17 ratio, allowing for differences due to chance. Incorrect The cross produces a 3:1 ratio, allowing for differences due to chance. Correct MC

f405_9865

Offspring phenotype	Predicted ratio	Observed
A–B–	1	53
A–bb	1	64
aaB–	1	44
aabb	1	71

You perform a dihybrid testcross (AaBb × aabb) and count the offspring phenotypes. Assume independent assortment and complete dominance.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions differ from 1:1:1:1. Incorrect The cross produces a 9:3:3:1 ratio, allowing for differences due to chance. Incorrect The observed counts must be exactly 58:58:58:58, in the table's category order. Incorrect The cross produces a 1:1:1:1 ratio, allowing for differences due to chance. Correct MC

e6ba_89f3

Offspring phenotype	Predicted ratio	Observed
A–B–	1	45
A–bb	1	51
aaB–	1	48
aabb	1	44

You perform a dihybrid testcross (AaBb × aabb) and count the offspring phenotypes. Assume independent assortment and complete dominance.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions follow 45:51:48:44; observed differences are due to chance. Incorrect The offspring proportions differ from 1:1:1:1. Incorrect The offspring proportions follow 1:1:1:1; observed differences are due to chance. Correct The offspring proportions follow 9:3:3:1; observed differences are due to chance. Incorrect MC

42b5_7081

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	58
Recessive phenotype (aa)	1	22

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions differ from 3:1. Incorrect The cross's predicted offspring ratio changes with the sample size. Incorrect The cross produces a 3:1 ratio, allowing for differences due to chance. Correct The observed counts must be exactly 60:20, in the table's category order. Incorrect MC

6572_8c65

Offspring phenotype	Predicted ratio	Observed
A–B–	1	65
A–bb	1	57
aaB–	1	52
aabb	1	42

You perform a dihybrid testcross (AaBb × aabb) and count the offspring phenotypes. Assume independent assortment and complete dominance.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions follow 9:3:3:1; observed differences are due to chance. Incorrect The offspring proportions differ from 1:1:1:1. Incorrect The offspring proportions follow 65:57:52:42; observed differences are due to chance. Incorrect The offspring proportions follow 1:1:1:1; observed differences are due to chance. Correct MC

91d5_ea26

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	113
Recessive phenotype (aa)	1	47

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross produces an offspring ratio different from 3:1. Incorrect The offspring proportions follow 3:1; observed differences are due to chance. Correct The observed counts must be exactly 120:40, in the table's category order. Incorrect The offspring proportions follow 113:47; observed differences are due to chance. Incorrect MC

2c08_f7f0

Offspring phenotype	Predicted ratio	Observed
A–B–	9	93
A–bb	3	28
aaB–	3	28
aabb	1	11

You perform a dihybrid cross (AaBb × AaBb) and count the F₂ offspring phenotypes. Assume independent assortment and complete dominance.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions follow 9:3:3:1; observed differences are due to chance. Correct The offspring proportions follow 93:28:28:11; observed differences are due to chance. Incorrect The offspring proportions differ from 9:3:3:1. Incorrect The observed counts must be exactly 90:30:30:10, in the table's category order. Incorrect MC

ca8b_5387

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	103
Recessive phenotype (aa)	1	33

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions follow 3:1; observed differences are due to chance. Correct The offspring proportions differ from 3:1. Incorrect The offspring proportions follow 103:33; observed differences are due to chance. Incorrect The cross's predicted offspring ratio changes with the sample size. Incorrect MC

aa41_d035

Offspring phenotype	Predicted ratio	Observed
Red flowers (RR)	1	59
Pink flowers (Rr)	2	131
White flowers (rr)	1	42

In a plant species with incomplete dominance, you cross two pink individuals (Rr × Rr) and score flower color.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions differ from 1:2:1. Incorrect The offspring proportions follow 59:131:42; observed differences are due to chance. Incorrect The offspring proportions follow 1:2:1; observed differences are due to chance. Correct The cross's predicted offspring ratio changes with the sample size. Incorrect MC

b214_add1

Offspring phenotype	Predicted ratio	Observed
Red flowers (RR)	1	61
Pink flowers (Rr)	2	106
White flowers (rr)	1	49

In a plant species with incomplete dominance, you cross two pink individuals (Rr × Rr) and score flower color.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross produces a 1:1:1 ratio, allowing for differences due to chance. Incorrect The observed counts must be exactly 54:108:54, in the table's category order. Incorrect The offspring proportions differ from 1:2:1. Incorrect The cross produces a 1:2:1 ratio, allowing for differences due to chance. Correct MC

d0fb_592d

Offspring phenotype	Predicted ratio	Observed
Red flowers (RR)	1	57
Pink flowers (Rr)	2	124
White flowers (rr)	1	47

In a plant species with incomplete dominance, you cross two pink individuals (Rr × Rr) and score flower color.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions differ from 1:2:1. Incorrect The cross produces a 1:1:1 ratio, allowing for differences due to chance. Incorrect The cross's predicted offspring ratio changes with the sample size. Incorrect The cross produces a 1:2:1 ratio, allowing for differences due to chance. Correct MC

b1d6_88c2

Offspring phenotype	Predicted ratio	Observed
Red flowers (RR)	1	52
Pink flowers (Rr)	2	112
White flowers (rr)	1	52

In a plant species with incomplete dominance, you cross two pink individuals (Rr × Rr) and score flower color.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross produces an offspring ratio different from 1:2:1. Incorrect The cross produces a 1:1:1 ratio, allowing for differences due to chance. Incorrect The cross produces a 1:2:1 ratio, allowing for differences due to chance. Correct The cross produces a 13:28:13 ratio, allowing for differences due to chance. Incorrect MC

47ca_673e

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	63
Recessive phenotype (aa)	1	17

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross's predicted offspring ratio changes with the sample size. Incorrect The offspring proportions follow 3:1; observed differences are due to chance. Correct The cross produces an offspring ratio different from 3:1. Incorrect The offspring proportions follow 63:17; observed differences are due to chance. Incorrect MC

a4e2_c14d

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	73
Recessive phenotype (aa)	1	27

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross produces a 1:1 ratio, allowing for differences due to chance. Incorrect The cross produces a 3:1 ratio, allowing for differences due to chance. Correct The offspring proportions differ from 3:1. Incorrect The cross's predicted offspring ratio changes with the sample size. Incorrect MC

3e40_3817

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	82
Recessive phenotype (aa)	1	22

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross produces a 41:11 ratio, allowing for differences due to chance. Incorrect The offspring proportions differ from 3:1. Incorrect The cross produces a 3:1 ratio, allowing for differences due to chance. Correct The cross's predicted offspring ratio changes with the sample size. Incorrect MC

3b25_ebed

Offspring phenotype	Predicted ratio	Observed
A–B–	9	143
A–bb	3	49
aaB–	3	40
aabb	1	24

You perform a dihybrid cross (AaBb × AaBb) and count the F₂ offspring phenotypes. Assume independent assortment and complete dominance.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross produces a 1:1:1:1 ratio, allowing for differences due to chance. Incorrect The cross produces a 9:3:3:1 ratio, allowing for differences due to chance. Correct The cross produces an offspring ratio different from 9:3:3:1. Incorrect The cross's predicted offspring ratio changes with the sample size. Incorrect MC

6437_90b1

Offspring phenotype	Predicted ratio	Observed
Dominant phenotype (A–)	3	123
Recessive phenotype (aa)	1	37

You cross two heterozygous individuals (Aa × Aa) and score the offspring phenotypes.

Which statement is the null hypothesis (H₀) for this chi-square test?

The offspring proportions follow 3:1; observed differences are due to chance. Correct The offspring proportions follow 1:1; observed differences are due to chance. Incorrect The cross produces an offspring ratio different from 3:1. Incorrect The cross's predicted offspring ratio changes with the sample size. Incorrect MC

c2be_8967

Offspring phenotype	Predicted ratio	Observed
A–B–	1	82
A–bb	1	69
aaB–	1	76
aabb	1	65

You perform a dihybrid testcross (AaBb × aabb) and count the offspring phenotypes. Assume independent assortment and complete dominance.

Which statement is the null hypothesis (H₀) for this chi-square test?

The cross's predicted offspring ratio changes with the sample size. Incorrect The offspring proportions differ from 1:1:1:1. Incorrect The cross produces a 1:1:1:1 ratio, allowing for differences due to chance. Correct The observed counts must be exactly 73:73:73:73, in the table's category order. Incorrect