Anthropology 101.5

Anthropology 101.5 - Natural selection different levels of...

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Natural selection: different levels of fitness depending on genotypes or phenotypes - Process by which genotypes and phenotypes with greater fitness leave, on average, more offspring than do less fit genotypes and phenotypes. - Selection acts first through viability - Selection then acts on fertility - Species produce more offspring than can possible survive - Part of the variation in the ability to survive reproduce is hereditable - Individuals vary in their ability to survive and reproduce (fitness level) - Ex. The peppered moth. Peppered moths possess natural variation with some moths light colored and some dark. Different colored moths had a selective advantage when conditions changed. Those moths survived and reproduced better than moths of the original color. - There are patterns of natural selection - Stabilizing selection: no major change in mean size. Reduces variation. In the original population there were more outliers, after selection the variation decreases - Directional selection: selection against one extreme or the other. Causes a change in the
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Anthropology 101.5 - Natural selection different levels of...

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