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13 Cards in this Set
- Front
- Back
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exaptation
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a structure that evolves and functions in one environmental context, but performs an additional function when placed in a new environment
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Adaptive radiation
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evolutionary divergence of members of a single phylogenetic line into a variety of different adaptive form, usually in response to the availability of a diverse new habitat
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Condition needed for adaptive radiation to take place
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genetic variation must be available to take advantage of an empty niche
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reversion/reversal
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reappearance of ancestra characters that have been absent in intervening generations
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homoplasy
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two or more species have the same character, but it wasn't derived froma common ancestor
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living fossils
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species that morphologically haven't changed much from their fossil ancestors in the distant past
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Eldredge and Gould
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proposed theory of punctuated equilibria in 1972
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punctuated equilibria
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evolution occuring in spurts
evolution proceeds relatively rapidly during speciation |
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allometric growth
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difference in relative rates of growth of various parts of the body
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heterochrony
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evolutionary changes in the timing or rate of development
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paedomorphosis
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mature adult retains features that were characteristic in the juveniles of its ancestral species
ex. humans, newt thinger |
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hypermorphosis
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extending development past the ancestral stage
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HOX genes
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regulatory genes that affect morphological evolution
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