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AP Biology 7.5: Hardy-Weinberg Equilibrium

Practise AP Biology 7.5 questions by using Hardy-Weinberg assumptions and equations to calculate frequencies and test a non-evolving model.

Syllabus
Effective Fall 2025
Course
AP Biology

Exam points

  • identify the five Hardy–Weinberg conditions and explain their role in a non-evolving population
  • calculate allele and genotype frequencies using p, q, p², 2pq and q²
  • derive carrier and phenotype frequencies from population counts for dominant, recessive and codominant alleles
  • compare observed and expected frequencies with chi-square evidence to evaluate equilibrium or evolutionary change

Covered syllabus points

7.5.A—Describe the conditions under which allele and genotype frequencies will change in populations

7.5 Hardy–Weinberg Equilibrium question 1

[Maximum number: 1]

A particular genetic disorder is associated with a single gene with two alleles. Individuals with two recessive alleles are affected. The prevalence of the disorder is 1 in 6,600. Assuming the population is in Hardy-Weinberg equilibrium, which of the following is closest to the frequency of carriers in the general population?

Figure 1. A signaling cascade triggers the relaxation of smooth muscle cells.

Figure 1. A signaling cascade triggers the relaxation of smooth muscle cells.

A

0.00015

B

0.01230

C

0.02430

D

0.98770

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