GRE Subject Test: Biochemistry, Cell, and Molecular Biology : Help with Hardy-Weinberg

Study concepts, example questions & explanations for GRE Subject Test: Biochemistry, Cell, and Molecular Biology

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Example Questions

Example Question #381 : Gre Subject Test: Biochemistry, Cell, And Molecular Biology

What are the phenotypic ratios for a given population for which the proportion of the dominant allele is 0.55 and that of the recessive allele is 0.45? 

Possible Answers:

Homozygous dominant: 0.50

Heterozygous: 0.30

Homozygous recessive: 0.20 

Homozygous dominant: 0.30

Heterozygous: 0.20

Homozygous recessive: 0.50 

Homozygous dominant: 0.20

Heterozygous: 0.50

Homozygous recessive: 0.30 

Homozygous dominant: 0.25

Heterozygous: 0.50

Homozygous recessive: 0.25

Homozygous dominant: 0.30

Heterozygous: 0.50

Homozygous recessive: 0.20 

Correct answer:

Homozygous dominant: 0.30

Heterozygous: 0.50

Homozygous recessive: 0.20 

Explanation:

To solve this problem, assume Hardy-Weinberg equilibrium and use the associated equations to solve:

   

 is dominant allele and  is recessive allele 

To find the phenotype ratios:

 homozygous dominant 

 heterozygous 

 homozygous recessive 

Example Question #31 : Molecular Biology And Genetics

Which of the following is not a tenet of Hardy-Weinberg equilibrium?

Possible Answers:

Genetic drift

No natural selection

Randomized mating

No migration

Large population

Correct answer:

Genetic drift

Explanation:

The Hardy-Weinberg equilibrium does not account for genetic drift. The Hardy-Weinberg law states that genetic frequencies will remain constant in a population from generation to generation in the absence of evolutionary influences. Therefore, there is no migration, natural selection, nonrandom mating, or small populations in a Hardy-Weinberg population.

All GRE Subject Test: Biochemistry, Cell, and Molecular Biology Resources

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