Biology 1001A Lecture Notes - Lecture 16: Assortative Mating, Inbreeding Avoidance, Eye Color
16 Jun 2016
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Selection weeds out harmful alleles, but mutation reintroduces them back into the population, therefore they work in opposition to one another. Gene flow (migration) moves alleles between populations for hardy-weinberg equilibrium, the population must be closed to gene flow/migration. Like mutation, can introduce new alleles (similar effects) Individuals that migrate into the population bring in new alleles/adaptations, selection reduces the amount of alleles within the population; also work in opposition. Hardy-weinberg assumes random mating with respect to genotype. There are usually mating preferences in insects, brothers and sisters often breed together. In plants, it is the opposite, so inbreeding is avoided. Eye colour (blue eyed people only mate with other blue eyed people) Disassortative: mates pick another mate with an opposite trait than themselves. Each genotype mates only with itself (aa and aa) This population is now not in hardy-weinberg. Dissasortative: individuals mate with another individual who obtains an opposite trait (tall people only mate with short people).
