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Lecture 12

ANTH 1210 Lecture 12: Lecture 12

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University of Manitoba
ANTH 1210
Haskel J.Greenfield

oS98 Limits on population growth: war, famine, disease, high infant mortality, abstinence, coitus interruptis (birth control) Population sizes kept stable: prevent some young from reaching adulthood, and prevent some from reproducing Key concept for Darwin Natural Selection: 3 principles by Darwin: Variation: Considerable variation in form (within any population or species) None two are identical Differential mortality: Certain variations provide better adaptation to environment These individuals live longer and produce more offspring Inheritance: Beneficial variations inherited by next generation Produce more offspring (because they inherited good traits) Process continues until better adapted variation becomes normal Variations not as adapted are weeded (die off) out by environmental pressure Principle of Natural Selection: survival of the fittest Fittest does not equal Darwinian Fitness (big does not equal best) Best strategy to ensure inheritance of genotype: produce as many healthy, and wellcared for offspring as possible Tradeoff between having many poorercared vs. fewer bettercared offspring Altruism: Those who do not reproduce either because they are sterile or unwilling Bees, ants, termites, heterosexuals, homosexuals, childcare workers Fitness of zero? Darwin and Wallace: 1858 Alfred Russel Wallace (young naturalist) published article with Darwin Independently come to same conclusions his research in New Guinea and Indonesia Famous for Wallace line 1859: Published Origin of Species (how evolution occurs Natural Selection)
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