ANTHRO 101 Lecture Notes - Lecture 8: East Los Angeles College, Genetic Drift, Allele Frequency
Document Summary
Factors that promote the net differential reproductive success of individuals. Small number of coin toss, easier to fluctuate. Gene drift takes its biggest toll through small populations. *****our example focuses on genetic drift as the random loss of alleles of a population of a gene pool. The effects of genetic drift depend on pop. size. We"ve historically lived in smaller populations which means we"re still highly susceptible to genetic drift. Lose alleles through chance events in recombination. Gene frequency of b allele = . 05 (1/20) 2 aa: 2 ab = a 50/50 chance. 2nd type of gene drift: founder effect. Loss of genetic variation that occurs as a new population is founded by a small non random sample of a parent population. People go to plymouth and found a new population that grows, they left a parent pop in england to found a new one.
