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AP Biology/Biology 101
Hardy-Weinberg Equation Practice
1. If 98 out of 200 individuals in a population express the recessive
phenotype, what percent of the population are homozygous dominant?
2. If 98 out of 200 individuals in a population express the recessive
phenotype, what percent of the population are heterozygotes?
Brown hair (B) is dominant to blonde hair (b). If there are 168
brown hairs in a population of 200:
3. What is the predicted frequency of heterozygotes?
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4. What is the predicted frequency of homozygous dominant?
5. What is the predicted frequency of homozygous recessive?
If blondes occur in 36% of the population:
6. What is the allele frequency for b?
7. What is the allele frequency for B?
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8. What is the predicted frequency of heterozygotes?
9. What is the predicted frequency of homozygous dominant?
10.
A large population of flour beetles is allowed to breed randomly for
several generations under laboratory conditions. Initially, 36 percent of the
population had short elytra, a homozygous recessive trait, but after several
generations of breeding, the number of short elytra beetles decreased to 25
percent of the population. The rest of the beetles in the population have
long elytra, which is the phenotype for both homozygous dominant and
heterozygous genotypes.
What is the frequency of the homozygous dominant genotype in the initial
population of beetles?