K.Species - Speciation On the Origin of Species SPECIATION...

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Speciation Heyer 1 On the Origin of Species … Speciation – Anagenesis • Change in a species gene pool and phenotype – Cladogenesis • Change in a population to become distinct from parent population • Branching increase diversity SPECIATION Species: “kind” • Biological Species Concept • Species Barriers • Other Species Concepts • Tempo of Evolution Biological Species Concept Species (“…each reproducing according to its kind .”): – Group of populations who can interbreed. Reproductive Isolation – Barriers to interbreeding between species are: prezygotic - before fertilization postzygotic - after fertilization Prezygotic Barriers • Habitat Isolation • Behavioral Isolation • Temporal Isolation • Mechanical Isolation • Gametic Isolation Indian rhinoceros African black rhinoceros Prezygotic Barriers • Habitat Isolation • Behavioral Isolation • Temporal Isolation • Mechanical Isolation • Gametic Isolation Behavioral Isolation Similarity between different species. The eastern meadowlark ( Sturnella magna, left) and the western meadowlark ( Sturnella neglecta, right) have similar body shapes and colorations. Nevertheless, they are distinct biological species because their songs and other behaviors are different enough to prevent interbreeding should they meet in the wild. Figure 24.3 A
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Speciation Heyer 2 Hawaiian Drosophila The mate recognition concept of species Prezygotic Barriers • Habitat Isolation • Behavioral Isolation • Temporal Isolation • Mechanical Isolation • Gametic Isolation western spotted skunk mates in late summer eastern spotted skunk mates in late winter Prezygotic Barriers • Habitat Isolation • Behavioral Isolation • Temporal Isolation • Mechanical Isolation • Gametic Isolation insects Prezygotic Barriers • Habitat Isolation • Behavioral Isolation • Temporal Isolation • Mechanical Isolation • Gametic Isolation
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This note was uploaded on 09/02/2011 for the course BIOL 6C taught by Professor Sundram during the Spring '09 term at DeAnza College.

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K.Species - Speciation On the Origin of Species SPECIATION...

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