BIOLOGY 1M03 Chapter Notes - Chapter 25: Stabilizing Selection, Genetic Drift, Archaea
30 Jan 2013
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Document Summary
The hardy-weinberg principle acts as a model for generating predictions consistent with a hypothesis when researchers want to test whether one among 5 factors is affecting a particular gene. Inbreeding, as exemplifies most-conspicuously in its extreme-through selfing, changes genotype frequencies but does not change allele frequencies. Sexual selection leads to the evolution of traits that help individuals attract mates. It usually affects more strongly the traits of members in the gender that invests ledd in offspring and benefits more from being promiscuous that traits of the gender that invests more in offspring and benefits more from being choosy. Inbreeding and sexual selection are the most-intensively studied phenomena for the fifth factor, biased mating, which still could effect evolutionary change. The four factors that tend to change allele frequencies are natural selection, genetic drift, gene flow and mutation: natural selection: increases the frequency of certain alleles, genetic drift: causes allele frequencies to change stochastically.
