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Sexual selection on traits involved in mate choice can lead to complex patterns of genetic variation...

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Biology

Sexual selection on traits involved in mate choice can lead tocomplex patterns of genetic variation in populations. The AfricanGreat Lakes contain a stunning diversity of cichlid fish species,which have recently evolved due to a combination of ecologicaladaption and sexual selection. In one recently evolved species, weobserve the following pattern: An autosomal (not sex linked) locus“X” involved in pigmentation has different effects in male fishthan female fish. There are two alleles in this system. In males,“x” acts recessively to produce bright red gill markings, while infemales, the same allele acts dominantly to produce a dull stripedpattern. A survey of male fish reveal that 56.25% have bright redgill markings.

A.)If we assume the population is in H-W equilibrium, whatpercentage of the female fish do we expect to have the dull stripedpattern?

B.) In the scenario above, the phenotypic effect of alleles atlocus X is dependent on the allelic state of the sex determininglocus in these fish. What is the term for this kind of geneticinteraction?

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1Afrequency of 2pq frequency of q2 0375    See Answer
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