In Lake Malawi cichlid fishes, one can observe two color variants, Black Barred (BB) and Orange Blotch (OB)
Sex in these fishes are not determined by a sex chromosome, but rather by a gene on an autosome which produces either males or females. Both of these phenotypes are controlled by one biallelic locus each. OB females have a selective advantage in terms of their survivability: The OB phenotype allows females to blend into their background. OB males have a selective disadvantage because their reproductive coloration is dis-rupted and they have little mating success. How would this process influence the as-sociation of alleles at the color locus and sex determining locus?
What will be an ideal response?
ANS:
Natural selection would operate to generate linkage disequilibrium between the two loci in which the female allele would become associated with the OB allele and the male allele would become associated with the BB allele.
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