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Chapter 2

ANTH 1210 Chapter 2: Topic 22

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ANTH 1210
Haskel J.Greenfield

o78P Pressures in environment eliminate those individuals in the gene pool least able to survive Changes in response to environment ADAPTATION Directional selection Normalizing selection e.g. birth weight NonDarwinian evolution Natural selection is directional process Pressures of environment o Pushgeno and phenotype in specific directions NonDarwinian = random Cannot predict direction of change Not necessarily adaptive Loss in genotypic variability 2 types Genetic drift Random processes that affect gene frequencies Occurs in small isolated populations Acts along genetic variability Produces changes in proportions of gene combinations o From one generation to next Large populations random change will not affect overall structure of population Small population introduction of new gene has greater impact Accounts for spread of deleterious genes Creates homozygosity o Within a few generations, homozygous population can be reached Good = adaptive Bad = deleterious Neutral = no effect
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