14 - o Genes for buildup of fat reserves were advantageous...

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Single Gene Variation SLI = specific language impairment o Mutation of FOXP2 gene o KE family had mutation in 1 copy of gene o Heterozygous had dominant trait (SLI) o Causes variation within a family Genetic Variation Within Groups Many diseases caused by recessive genes Why not eliminated? o As natural selection removes, mutation replaces o Heterozygote advantage: Having recessive gene helps against other diseases E.g. sickle cell and malaria, Tay-Sachs and TB Change in Environment NIDD and famine o People used to subsist through farming and fishing o Change in environment (colonization, mineral wealth) led to lifestyle changes
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Unformatted text preview: o Genes for buildup of fat reserves were advantageous in times of famine, now deleterious b/c availability of food and sedentary lifestyle Genetic Variation Among Groups • Natural selection can maintain genetic differences in the face of gene flow if selection is strong enough • Blood types: o A, AB, B, 0 o AB = universal recipient o 0 = universal donor o A and AB more susceptible to smallpox o A less susceptible to black plague and cholera o 0 less syphilis • Lactose intolerance o Lose ability to digest lactose after weaning o Some retain ability into adulthood...
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This note was uploaded on 06/12/2011 for the course ANTH 101 taught by Professor Scarre during the Spring '07 term at UNC.

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14 - o Genes for buildup of fat reserves were advantageous...

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