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12 Cards in this Set
- Front
- Back
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Artificial selection |
Selection done by humans |
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Natural Selection of traits |
Traits that enhance survival and reproduction increase gradually in frequency |
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Group Selection |
Due to altruism |
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Descent with modification |
Change in form from ancestor |
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Three modes of natural selection |
1) directional selection 2) stabilizing selection 3) disruptive selection |
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Directional Selection |
One extreme of the phenotypic spectrum favoured while the other extreme is disfavoured |
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Stabilizing Selection |
Intermediate phenotypes of population favoured |
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Disruptive Selection |
The intermediate types are selected against |
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Sexual Selection |
Increase mating fitness but not necessarily survival |
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Handicap Theory |
Costly character for survival of male but positively useful to female |
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Sexual Selection works |
1) mate competition 2) mate choice |
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Polygamous Species |
• More developed sexual characters • Stronger sexual dimorphism |
