In a population of 250 guinea pigs, 160 have rough coats while the remaining has smooth
coats. (Note: smooth coat is recessive.)
a. Calculate the allele and genotype frequencies. (Hint: which value should you first
calculate?) _________
b. How many guinea pigs are expected to be homozygous for rough coat? (Give the actual
count.)
3. In a population of gophers, the y allele occurs at a frequency of 0.128. Give the frequency
of the genotypes YY, Yy and yy. (Assume that the population is at equilibrium.)
Hint: First, determine what frequency 0.128 represent then use it to find the other values.
4. Part A: You found a population of 300 beetles (in which black is dominant to brown). Fifty of
the beetles are brown. (a) Determine the allele and genotype frequencies. (b) How many of
the population are heterozygous?
Part B: If further studies revealed that 150 of the beetles were homozygous dominant, is the
population at equilibrium? Explain using the chi-square test.