In a population of chimpanzees, you find high infection rates of a highly virulent virus. Resistance to the
virus is conferred by an allele with incomplete dominance (semi-dominance). Homozygotes are completely resistant, are expected to live a long life and have, on average, 8 offspring. Approximately 30% of the heterozygotes will die from the infection before reaching maturity; those that do survive will have 6 offspring on average. Only 10% of homozygotes for the susceptible allele will survive to
maturity and those that survive will have only 1 offspring on average. What are the relative fitnesses of
the three genotypes?
a) Resistant homozygous: 1; heterozygote: 0.1125; susceptible homozygote: 0.125
b) Resistant homozygous: 1; heterozygote: 0.7; susceptible homozygote: 0.1
c) Resistant homozygous: 1; heterozygote: 0.525; susceptible homozygote: 0.0125
d) Resistant homozygous: 0.8; heterozygote: 0.42; susceptible homozygote: 0.1
e) Resistant homozygous: 0.5; heterozygote: 0.25; susceptible homozygote: 0.5
The correct answer is C, but I do not know how to come to that conclusion.