AP Bio - Hardy Weinberg Quiz

1. The frequency of two alleles in a gene pool is 0.19 (A) and 0.81(a). Assume that the population is in Hardy-Weinberg equilibrium. The percentage of heterozygous individuals in the population is ​ ​ (a)   and the percentage of homozygous recessive individuals is ​ (b)  

• .30
• .65
• .05
• .35
• .60
• .10

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2. An allele A, for white wool, is dominant over allele a, for black wool. In a sample of 900 sheep, 891 are

white and 9 are black. Calculate the allele frequencies within this population, assuming that the

population is in H-W equilibrium.

Groups:

(a) Dominant Alleles

,

(b) Recessive Alleles

,

(c) Gordon

• 
• .90

• .10

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3. In a population that is in Hardy-Weinberg equilibrium, the frequency of the recessive homozygote

genotype of a certain trait is 0.09. Calculate the percentage of individuals homozygous for the dominant

allele.

(a)  

in a population that is in Hardy-Weinberg equilibrium, 38 % of the individuals are recessive

homozygotes for a certain trait. In a population of 14,500, calculate the percentage of homozygous

dominant individuals and heterozygous individuals. Then calculate the number of individuals with

those two genotypes.

Groups:

(a) %AA

,

(b) #AA

,

(c) %Aa

,

(d) #Aa

• .47

• 2175

• 6815

• .15

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Allele A, for the ability to taste a particular chemical, is dominant over allele a, for the inability to taste

the chemical. Four hundred university students were surveyed and 64 were found to be nontasters.

Calculate the percentage of heterozygous students. Assume that the population is in H-W equilibrium.

• 0.36

• 0.16

• 0.48

• 0.4

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n humans, the Rh factor determines if you have “positive or negative” (+/-) blood. The gene is

inherited independently of the ABO blood type alleles. Rh+ individuals have the Rh antigen on their

red blood cells, while Rh− individuals do not. There are two different alleles for the Rh factor known

as Rh+ and rh-. The Rh+ allele is dominant and produces the Rh+ phenotype.

In a population that is in Hardy-Weinberg equilibrium, if 160 out of 200 individuals have Rh+ blood,

calculate the frequencies of both alleles.

• 0.89

• rH- a=

• Yes, Chef

• rH+ A=

• 0.11

• Lets Cook

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 In corn, kernel color is governed by a dominant allele for white color (A) and by a recessive allele (a).

A random sample of 100 kernels from a population that is in H-W equilibrium reveals that 9 kernels are yellow (ww) and 91 kernels are white.

(a) Calculate the frequencies of the yellow and white alleles in this population.

A= ​ (a)   and a= ​ (b)  

(b) Calculate the percentage of this population that is heterozygous.

Aa= ​ (c)  

• 0.7
• 0.3
• 0.42
• 0.1, 0.9, 0.1
• 0.5, 0.5, 0.5
• 0.2, 0.8, 0.3

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In a certain African population, 4 % of the population is born with sickle cell anemia (aa). Individuals

that are heterozygous have the advantage of increased resistance to malaria. Calculate the percentage of

individuals who are heterozygous.

(a)  

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In the United States, approximately one child in 10,000 is born with PKU (phenylketonuria), a syndrome

that affects individuals homozygous for the recessive allele (aa).

Groups:

(a) a=

,

(b) A=

,

(c) Aa=

• 0.99

• 0.01

• 0.02

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