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12 Cards in this Set
- Front
- Back
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speciation
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-the formation of new species leads to biological diversity and therefore macroevolution.
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macroevolution
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-large scale evolutionary changes
ex. patterns, trends, rates of change, extinctions, speciations |
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reproductive isolation
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the bases for speciation
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PREZYGOTIC ISOLATING MECHANISMS
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Ecological(habitat) isolation,
Temporal isolation behavioral isolation mechanical isolation gametic isolation |
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zygote mortality
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the gametes are close enough to merge but the zygote dies
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hybrid sterility
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the genes are different bu close enough to breed, but the offspring cannot reproduce
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F2 Fitness
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whether the 2nd generation are fertile or not, some mules may be fertile, but their offspring will not be
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Allopatric Speciation
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-A physical barrier between populations --> reproductive isolating mechanisms evolve
--> no interbreeding--> speciation. ex. gallapigos islands |
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Allo
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other
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Patric
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country
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SYmpatrick speciation
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speciation takes place within the home range of an existing species
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Polyploidy
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- 3 or more of each type of chromosome .
-Chromosomes or DNA do not separate properly during meiosis. -usually occurs in plants -1/2 of all angiosperms are polyploidy -Hybrids + cell division errors --> polyploidy |
