Maturity and those that survive will have only 1 offspring


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. 

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Biology: Maturity and those that survive will have only 1 offspring
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