ANTH 161 Lecture Notes - Lecture 2: Blending Inheritance, Molecular Genetics, Social Darwinism
8 Sep 2016
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Natural selection explained how species change through time. Understanding darwin: darwinian fitness = reproductive success, no inherent direction or inevitable result, evolution is ongoing, natural selection is just one mechanism for change. Social darwinism: notions of evolution as progress, there us a pre-ordained endpoint, survival of the fittest , primitive societies are less evolved, all justify their purposes. Ideas of inheritance: blending of traits of mother and father (darwin subscribed to widely held belief of the day, traits in the blood, examples in breeding (purposely bred animals) Experiments on pea plants wrote experiments with plant hybrids published 1865 (rediscovered 34 years later & translated 1901) Pea seed color: (used pure strains bred true) Cross-bred pea plants with green and yellow seeds. Generation 2: ratio of 3:1 (yellow to green) Independent assortment: traits are inherited independently, example: breeding round yellow peas with wrinkled green ones. Some traits behave the way mendel"s pea experiments did.
