BIOL359 Chapter Notes - Chapter 7: Population Genetics, Allele Frequency, Genetic Drift
11 Jan 2014
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Chapter 7: mendelian genetics in populations ii- migration, 7. 1| migration: migration is the movement of alleles between populations, migration means gene flow, transfer of alleles from the gene pool of one population to the gene pool of another population. In practice, migration is most important in preventing populations from diverging: one round of matign will put the population back into hw equilibrium for genotype frequencies. Migration as a homogenizing evolutionary process: migration tends to homogenize allele frequencies across populations. If migration was allowed to proceed unopposed by any other mechanism of evolution, migration will eventually homogenize allele frequencies across populations completely. 7. 2| genetic drift: genetic drift doesn"t result in adaptation but it does lead to changes in allele frequencies. In the hw model, genetic drift results from violation of the assumption of infinite population size. In populations of finite size, change evens- in the form of sampling error in drawing gametes from the gene pool- can cause evolution.
