Term
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Definition
| origin of new species, the focal point of evolutionary theory and the appearance of new species source of biological diversity |
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Term
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Definition
| origin of new species, the focal point of evolutionary theory and the |
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Term
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Definition
| evolutionary changes higher than the species level, deals with the appearance of evolutionary novelties, defines higher taxonomic groups |
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Term
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Definition
| evolutionary changes higher than the species level, deals with the |
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Term
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Definition
| phyletic evolution, 1 species gradually becomes another |
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Term
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Definition
| branching evolution, 1 species becomes 2 or 3 species, increases number of species and promotes biological diversity |
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Term
| what are the two prezygotic reproductive barriers? |
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Definition
| impede mating, prevent fertilization |
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Term
| what are the five prezygotice isolations? |
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Definition
| habitat isolation, behavorial isolation, temporal isolation, mechanical isolation and gametic isolation |
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Term
| describe habitat isolation |
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Definition
| species cant or dont get together |
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Term
| describe temporal isolation |
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Definition
| different mating periods of time |
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Term
| describe behavorial isolation |
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Definition
| rituals performed to attract |
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Term
| describe mechanical isolation |
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Definition
| different anatomy, color, shape, lacking abilities |
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Term
| describe gametic isolation |
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Definition
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Term
| what is reduced hybrid viability? |
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Definition
| zygote fails to develop or reach sexual maturity |
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Term
| what is reduced hybrid fertility? |
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Definition
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Term
| what is hybrid break down? |
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Definition
| hybrid produces offspring but offspring not viable or fertile |
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Term
| what is allopatric speciation? |
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Definition
| gene flow interrupted by geographic barrier |
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Term
| what is sympatric speciation? |
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Definition
| gene flow interrupted without geographical barrier, subpopulations are fixed on resources not used by parental populations, sexual selection in polymorphic population |
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Term
| describe gradualism as a tempo of speciation |
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Definition
| one species gradually evolves into new species, represents microevolution, big changes occur through accumatation of small changes |
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Term
| what is punctuated equilibruim? |
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Definition
| long periods of stasis punctuated by episodes of speciation. species develop in spurts of rapid NOT slow & gradual change |
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