BIOL150 Chapter Notes - Chapter 6: Phenotypic Trait, Assortative Mating, Panmixia
14 Sep 2018
School
Department
Course
Professor
Document Summary
6. 1 evolutionary processes: various processes disrupt the hardy-weinberg equilibrium. Mutations: heritable change in the structure of genes or chromosomes: random, the mutation rate is affected by many factors, eg uv radiation, might be beneficial, neutral or harmful, can alter allele frequencies. If a population remains small after a bottleneck, it is vulnerable to further genetic drift. Even if the population recovers, its genetic diversity if often reduced, increasing its vulnerability to environmental change. Gene flow: movement of genes between populations as a result of migration. If an individual moves into a population but does not successfully reproduce, its genes are not introduced into the gene pool. In circumstances where individuals do reproduce, migration is a potent force in reducing genetic differences among local populations (assuming their genetic composition differs) Whether positive or negative, assortative mating changes genotypic frequencies between generations but does not directly alter allele frequencies.
