Biology 1001A Lecture Notes - Lecture 13: Genetic Drift, Heterozygote Advantage, Assortative Mating
6 Dec 2017
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Document Summary
Average number of surviving offspring for each genotype is defined as its absolute fitness, w. Divide by the absolute finess of most successful genotype to calculate relative fitness, w. The closer to one, the more likely selection is not occurring. Relative fitness is always between 0 and 1. 0. This lowers the genetic variation from the population, which is the exact opposite of heterozygote advantage. If mating is random, common alleles are found in homozygotes, and rare alleles are found in heterozygotes. In heterozygote disadvantage, the selection will be against the rare allele, so the frequency will decrease in the rare allele, allowing them to diminish in numbers. Assortative mating: like mates with like; effects only a single trait; takes out of hw population. Inbreeding: choosing similar traits to you, so that their entire genome is like yours. Genetic drift: is the random change in one generation to the next. Not all gametes make it to the next generation.
