BIOLOGY 1M03 Lecture 3: BIOLOGY 1M03 Chapter 25 Part 1
6 Oct 2016
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Biology 1m03- chapter 25 evolutionary processes part 1. The hardy-weinberg principle acts as a model for generating predictions consistent with hypotheses when researchers want to test whether one among 5 factors ultimately is affecting frequencies for alleles encoding a particular trait. Four factors affect allele frequencies, and each can effect different consequences. Genetic drift causes stochastic fluctuations in alleles frequencies. Gene flow (migration) equalizes allele frequencies between population. Mutation introduces new alleles inbreeding and assortative mating, as exemplified most conspicuously in their extreme- through selfing, change genotype frequencies but do not change allele frequencies. Sexual selection leads to evolution of traits that help individuals attract mates. It usually affects more strongly the traits of members in the gender that invests less in offspring and benefits more from being promiscuous than traits of the gender that invests more in offspring and benefits more from being choose.
