10: Population Genetics

Allele frequencies, Hardy-Weinberg equilibrium, inbreeding, and population-level variation.

LibreTexts reference: Population Genetics

Hardy-Weinberg Equilibrium Conditions

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

• no genetic drift is actively occuring
• no inbreeding is actively occuring
• the gene copy number is NOT changing due to chromosomal alterations
• all genotypes are equally likely to survive
• gene flow is actively occuring

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Hardy-Weinberg Variables

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In the garden population of flowers, there is a display of complete dominance in petal color. Individuals with at least one P allele show the red petal color, while those no P alleles show the yellow petal color.
A group of 10000 flowers were observed. 7191 exhibited the red petal color, while 2809 showed the recessive form of yellow petal color.
Which Hardy-Weinberg variable is represented by the fraction 

7,191

10,000

 ?

• p — Frequency of the dominant allele
• q — Frequency of the recessive allele
• p² — Frequency of homozygous dominant individuals
• 2pq — Frequency of heterozygous individuals
• q² — Frequency of homozygous recessive individuals
• p² + 2pq — Frequency of individuals with the dominant phenotype
• 2pq + q² — Frequency of individuals that are NOT homozygous dominant

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