PSYC326_2

PSYC326_2 - PYSC 326 NOTE 2 Natural Selection and Evolution...

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PYSC 326 – NOTE 2 Natural Selection and Evolution Charles Darwin observed, classified, [inferred] natural selection evolution Functionalism and the Inheritance of Traits THEME the principle of natural selection guides the thinking of physiological psychologists by asking what is the selective advantage of the trait, how it makes evolutionary sense Darwin emphasized function significance of structure, color, behavior functionalism characteristics of living organisms perform useful functions idea that biological phenomena is understood by their usefulness for the organism e.g., adaptive trait butterflies and moths with ‘eyes’ on their wings are not preyed on by birds Darwin formulated his theory of evolution to explain acquisition of adaptive characteristics noted variation of characteristics noted breeders used artificial selection theorized natural selection as the cornerstone principle of his theory [conferring fitness] ` Darwin had no idea of the mechanism for creating variations and passing on traits mechanism chromosomes mutations selective advantage natural selection for physical traits affects behaviors indirectly mutations that are not immediately favorable but do not offer disadvantages either are passed on Evolution of the Human Species evolution a gradual change in structure and physiology of plant and animal species, generally producing more complex organisms, as a result of natural selection amphibians 360 mya stirrup bone only in middle ear, more jaw bones reptiles 290 mya stirrup bone only in middle ear, more jaw bones anapsids turtle ancestors diapsids ancestors to dinosaurs, birds, lizards, crocodiles, snakes synapsids
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PSYC326_2 - PYSC 326 NOTE 2 Natural Selection and Evolution...

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