In a large randomly mating population the frequency of a recessive allele a is 0.20. The genotype aa has a relative fitness of 0.50, and AA and Aa both have a relative fitness of 1. Selection acts once, before the adults breed. What is the frequency of a among the gametes that make the next generation?

BiologyAdvancedHigh School (11–12)Heredity and Evolution › Evolution Olympiad

In a large randomly mating population the frequency of a recessive allele $a$ is $0.20$ . The genotype $aa$ has a relative fitness of $0.50$ , and $AA$ and $Aa$ both have a relative fitness of $1$ . Selection acts once, before the adults breed. What is the frequency of $a$ among the gametes that make the next generation?

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← Two genes assort independently. The allele a in the homozygous state (aa) makes the plant white whatever the other gene is. A plant with at least one A is black if it has at least one B, and brown if it is bb. Two plants of genotype AaBb are crossed. One black plant of the offspring is chosen at random and test crossed with an aabb plant. What fraction of the test cross progeny is expected to be brown?Two genes are linked on the same chromosome, 20 cM apart. A plant has the genotype Ab/aB (the dominant alleles are on different homologues). It is selfed, and there is no difference in the survival of gametes or zygotes. What fraction of the offspring is expected to show both recessive traits (aabb)? →

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