10: Population Genetics

Students calculate allele and genotype frequencies in populations, apply the Hardy-Weinberg equation, and evaluate factors that change allele frequencies.

LibreTexts reference: Chapter 10: Population Genetics

Matching Population Genetic Terms

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Match each of the following population genetic terms with their corresponding definitions.
Note: Each choice will be used exactly once.

	Your Choice	Prompt
	Drop Your Choice Here	1. random mating
	Drop Your Choice Here	2. mutation
	Drop Your Choice Here	3. genetic drift
	Drop Your Choice Here	4. assortative mating
	Drop Your Choice Here	5. gene flow

Drag one of the choices below:

• A. movement of alleles between populations
• B. mating between individuals with similar phenotypes
• C. mating in which every individual has an equal chance of pairing with any compatible mate
• D. a random change in the allele frequencies within a population
• E. unpredictable changes in the nucleotides that form a DNA sequence

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True/False Statements About Hardy-Weinberg Equilibrium Conditions

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Which one of the following statements is FALSE concerning Hardy-Weinberg equilibrium conditions for non-evolving populations?

• A. there are no genotype-based differences in reproductive success of individuals
• B. random mixing of gametes is actively occuring
• C. no mutations are actively occuring
• D. allele frequecies remain constant across generations
• E. alleles are moving into and out of the population

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Population Genetics Terms from Definitions

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Which one of the following population genetic terms correspond to the definition 'mating between genetically related individuals'.

• A. assortative mating
• B. consanguineous mating
• C. gene flow
• D. genetic drift
• E. mutation

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Hardy-Weinberg Variables from Population Data

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In the lake population of fish, there is a display of incomplete dominance in scale color. Individuals with two L alleles exhibit red, those with one L allele and one l allele exhibit orange, and those with two l alleles exhibit yellow.
A group of 10000 fish were observed. 4489 exhibited the red scale color, 4422 had the orange scale color, and 1089 showed the recessive form of yellow scale color.
Which Hardy-Weinberg variable is represented by the fraction 

4,489

10,000

 ?
Which Hardy-Weinberg variable is represented by the fraction 4489/10000?

• A. p — Frequency of the dominant allele
• B. q — Frequency of the recessive allele
• C. p² — Frequency of homozygous dominant individuals
• D. 2pq — Frequency of heterozygous individuals
• E. q² — Frequency of homozygous recessive individuals
• F. p² + 2pq — Frequency of individuals with the dominant phenotype
• G. 2pq + q² — Frequency of individuals that are NOT homozygous dominant

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Hardy-Weinberg Allele and Genotype Frequencies from Population Data (Numeric)

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snakes
genotype	phenotype	count
homozygous dominant	red	2,163
heterozygous	violet	924
homozygous recessive	blue	38
SUM		3,125

In a field there are 2,163 red snakes, 924 violet snakes, and 38 blue snakes that show incomplete dominance. What is the frequency of the dominant allele?
Note: Do not enter a percentage on the blank. For example, if the answer is 65.3%, enter 0.653 on the blank. Your answer will be a decimal value between 0 and 1.

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