Biology 1201A Study Guide - Final Guide: Decomposer, Parallel Evolution, Soltyrei

• School: Western University
• Department: Biology
• Course: Biology 1201A
• Professor: Michael Gardiner

Document Summary

Hardy-weinberg principle: specifies the conditions under which a population of diploid organisms achieves genetic equilibrium (the point at which neither allele frequencies nor genotype frequencies change in succeeding generations. Individuals in the population mate randomly with respect to genotypes. Genetic variation can occur: within individuals: proportion of heterozygous loci within an individual, within populations: number of polymorphic loci in the gene pool of a population, between populations: degree of difference in alleles, allele frequencies. Mutation: a heritable change in dna: so much variation is possible even though mutations are rare because some genes (homeotic) regulate the expression of other genes (on/off switch) Tends to erode genetic variation (an allele is lost while the other goes to fixation) 2: neutral variations: remain in the population because there is no fitness impact. Assortative mating: like mates with like inbreeding, homozygousity. By chance, some alleles may be totally missing, or the genes that were rare back home could be present.