Question

Problem 3) Butterflies show 3 phenotypes due to incomplete dominance at the D locus with alleles D^Y and D^B giving green phenotype in heterozygotes and yellow and blue in homozygotes

a) A population of butterflies showed 49% yellow, and 51% blue and green. What percentage of the gametes for the next generation would contain the D^B allele?

b) In another population only 1% of the butterflies are blue, What is the D^Y allele frequency?

c) If the butterflies were subject to predation by birds that could easily detect blue & yellow individuals what effect would you expect this to have on the genotype and allele frequencies over time? Indicate possible percentages.

Problem 4)   About 7% of men in a population are red-green colour blind due to a sex-linked recessive gene. Assuming random mating in the population with respect to colour blindness;

a) What percentage of women would be expected to be colour blind?

b) What percentage of women would be expected to be heterozygous?

c) What percentage of men would be colour blind in the next generation?

Answer 1