BIOL 150 Lecture Notes - Lecture 1: Asteroid Family, Panmixia, Mutation
Document Summary
Can randomly lose alleles from a gene pool; reduces variability over time. Random changes in allele frequency are much more obvious and have a greater impact on small populations so the smaller the population the greater the impact of genetic drift. Sometimes, reduces variation down to one allele per gene; called a xed allele (frequency = 1) Two natural events can create very small populations and instant genetic drift. 1. founder effect new small population: bottleneck effect random death, small population. Small part of population blown or rafted to an island. ****in both cases, new population is a random subset of original population less genetic diversity by chance. Bio 150: non-random mating , choosing a mate like yourself (inbreeding) Technically not evolution because there would be no change in the gene pool. Only the same alleles are paired (brown eyes with browns eyes/ blue eyes with blue eyes) *results in adaptation would be passed to their children.