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ANTH 1210 (69)
Chapter 2

ANTH 1210 Chapter 2: Topic 23

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ANTH 1210
Haskel J.Greenfield

o982 By either a few settlers, colonists or survivors of a catastrophe Occurs in small populations Loss in genetic variability Leads to population homozygosity Gene frequency of founder will differ from that significantly from parent population o Sampling error Founders represent a small and biased sample of original parent population Certain alleles may be completely absent In single generation, phenotype may change dramatically Gene Flow Genetic drift and natural selection cause populations to be pushed apart genetically Counteracts the tendency Gene flow causes populations to remainbecome more similar Transferssends genes from one population of a species to another Via migration or interbreeding Promotes homozygosity Keeps species together Without gene flow we would become different species Evolutionary process Mutations Non Darwinian evolution Genetic drift Founder effect Gene flow Natural selection Rate of Evolution Slow and gradual = Darwinian evolution Punctuated Equilibrium Slow gradual
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