BIOL 142 Chapter 22 Study Guide for TEST 1

BIOL 142 Chapter 22 Study Guide for TEST 1 - BIOL 142:...

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BIOL 142: Study Guide for TEST # 1 Chapter 22 – The Origin of Species Speciation = process by which new species arise - transformation of one species into another - splitting of one ancestral species into two descendant species Population = group of individuals of one species living in a given area - Allopatric = populations that are geographically isolated - Sympatric = populations that are geographically isolated Subspecies = distinct populations within a species In general, species are groups of organisms that are distinct phenotypically from other groups and may also utilize different parts of a habitat or behave separately from other groups Biological Species Concept (BSC) Species are defined as groups whose members are able to interbreed to produce viable offspring Speciation occurs because of reproductive isolation - Prezygotic Reproductive Isolation (prevention of zygote formation) o Geographic o Behavioral (example: difference in courtship/mating rituals) o Mechanical (example: dragonfly lock and key parts)
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