1.  The frequency of two alleles in a gene pool is 0.1 (A) and 0.9 (a).

2.  Allele W, for white wool, is dominant over allele w, the black wool. In a sample of 900 sheep, 891 are white and 9 are black.   

     Estimate the allelic frequencies in this sample, assuming the population is in equilibrium.

3.  In a population that is in Hardy-Weinberg equilibrium, the frequency of the recessive homozygote genotype of a certain trait is 0.07. 

    What is the percentage of individuals homozygous for the dominant allele?

4.  Allele T, for the ability to taste a particular chemical, is dominant over allele t, for the inability to taste it. At Cornell University, out of 

     400 students surveyed, 64 were found to be nontasters. What is the percentage of heterozygous individuals? Assume that the

     population is in equilibrium.

5.  A rare disease, which is due to a recessive allele that is lethal when homozygous, occurs with a frequency of one in a million. How 

      many individuals in a town of 14,000 can be expected to carry this allele?

1.  a. 18% Aa, b. 81% aa

2.  0.9 white, 0.1 black

3.  55%

4.  48%

5.  about 28 individuals