EvolutionPrinciples160-page5

EvolutionPrinciples160-page5 - adaptations o Those...

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Principles of Evolution - 5 Variation in Galapagos Finch Beak Share Variation in Mollusk Color Patterns The theory of Natural Selection was developed to explain adaptations and variations of organisms to their environment based on biological explorations, from the evolutionary evidences of the fossil record, and from anatomical studies. The major statements of this theory are: Variations exist among individuals of a species. Some of these variations are inherited (genetic). Species produce more offspring than can survive. Survival depends on ability to compete for food and resources. The individuals genetically better adapted to the surroundings survive and reproduce more offspring (therefore passing on the better suited
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Unformatted text preview: adaptations). o Those individuals having less favorable traits produce fewer offspring, so that less successful adaptations are not passed on as frequently. o This phenomenon is called differential reproduction and successive generations have more individuals with more favorable traits (genetically better adapted to their surroundings). o In natural selection, inherited traits that are adaptive (favorable) will become more frequent in the population at the expense of less adapted traits, which will appear less frequently in passing generations. Populations will change through time in response to environmental factors....
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This note was uploaded on 12/29/2011 for the course BIO 151 taught by Professor Edwards during the Spring '10 term at SUNY Stony Brook.

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