Term
| what are the 3 modes of natural selection? |
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Definition
directional
stabilizing
disruptive |
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Term
| define directional selection |
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Definition
| NS that is a unidirectional shift in the mean phenotype/genotype away from the mean of the previous generation that occurs when offspring w/an extreme phenotype has a relatively high freq |
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Term
| what's the best example of directional selection? |
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Definition
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Term
What happened during the drought in 1976-1978?
What is this an example of? |
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Definition
| there was directional natural selection on birds with larger beaks b/c they could crack harder, larger seeds. After the drought there was directional NS towards birds with smaller beaks as smaller, softer seeds were became more abundant. |
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