Imagine a population of pea plants that is in linkage equilibrium for two linked loci, flower color (P = purple, p = pink) and pollen shape (L = long, l = round).
a. What sort of selection event would create linkage disequilibrium? For example, will selection at just one locus (e.g., all red-flowered plants die) create linkage disequilibrium? How about selection at two loci (e.g., red-flowered plants die, and long-pollen plants die)? How about selection on a certain combination f genotypes at two loci (e.g., only plants that are both red-flowered and have long pollen grains die)? . Now imagine a population that is already in linkage disequilibrium for these two loci. Will selection for purple flowers affect evolution of pollen shape? How is your answer different from that to part a, and why?
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