BI111 Lecture Notes - Lecture 2: Allele Frequency, Genotype Frequency, New Zealand National Rugby Union Team
Document Summary
Mathematical model that predicts genotype frequencies: used as a null/control. All models have assumptions: random mating, large population size, no migration/emigration, no selection. Then take the hardy weinberg principle equilibrium and compare it to the observed. If so(cid:373)eo(cid:374)e"s clicker died it (cid:449)ould(cid:374)"t ha(cid:448)e a large i(cid:373)pact o(cid:374) the populatio(cid:374) size. Example: no differential contribution to the next generation. Phenotype is attributable to 2+ genes, interaction with the environment, or both. Follows mendelian inheritance patterns does not follow mendelian inheritance patterns. Genetic drift: loss of genetic variation. Natural selection: change in frequencies of alleles. Non-random mating: may change allele frequencies. Depending on environment, different phenotypes are adaptive or deleterious. If these phenotypes have a genetic basis, then selection on phenotypes will result in changes in the frequency of genotypes seen in the next generation (negative density) Immigration from other populations, experiencing different selective pressures. Evolution emcompasses all types of changes brought about by selection processes and chance events.
