Problem:

Question 1: A hypothetical population has two alleles for a gene: A and a. In a random sample of 100 individuals, 20 are homozygous for a, 20 are homozygous for A, and 60 are heterozygous. What is the frequency of A?

A. 20%

B. 25%

C. 50%

D. 60%

E. 80%

Question 2: The probability that two mutually exclusive events will occur is calculated by ________.

A. multiplying the probability of each individual event

B. adding the probability of each individual event

C. adding the probability of each individual event and subtracting 1

D. adding the probability of each individual event and multiplying by 2

Question 3: If a population is in Hardy-Weinberg equilibrium, which of the following statements is correct?

A) Each allele will be present at a 50% frequency.

B) Allele frequencies can vary from generation to generation, but the average frequency must remain constant.

C) The size of the population must remain constant from generation to generation.

D) Allele frequencies must remain the same from generation to generation.

E) The rate of change of allele frequencies must be greater than 1 percent from generation to generation.

Question 4: If there were a high allele frequency for the CCR5-?32 coreceptor, and the rate of infection with HIV was high as well, one would expect the frequency of the CCR5-?32 coreceptor allele to ________.

A) remain the same due to the lethality of AIDS

B) remain the same due to the population maintaining Hardy-Weinberg equilibrium

C) fall quickly due to heterozygote selection

D) rise quickly and confer resistance on a large part of the population

Question 5: A group of interbreeding individuals and their offspring is known as a(n) ________.

Please provide the best answer for these questions