6. Speciation 2008 posted

6. Speciation 2008 posted - Cause of evolution Random?...

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Unformatted text preview: Cause of evolution Random? Adaptive? Natural selection Sexual selection Genetic drift Migration Assortative mating Summary of Evolutionary Mechanisms Speciation: The Origin of Speciation: The Origin of New Species New Species I. Modes of Speciation II. Species Concepts III. Speciation by Cladogenesis IV. Reproductive Isolating Mechanisms A. Anagenesis : speciation through accumulation of heritable changes in a lineage B. Cladogenesis : speciation by branching of a lineage See text fig. 25.6 Speciation: The Origin of Speciation: The Origin of New Species New Species I. Modes of Speciation II. Species Concepts III. Speciation by Cladogenesis IV. Reproductive Isolating Mechanisms II. Species concepts 1. Phylogenetic 2. Biological 3. Evolutionary 4. Ecological 1. Phylogenetic species concept Ernst Mayr (1905-2005) Uses criteria members of the species themselves use Widely applicable 2. Biological species Biological species : One or more populations whose members have the potential to interbreed with one another in nature to produce fertile offspring, but who cannot interbreed with members of other species Or: One or more populations that share a common gene pool See text, p. 519 Speciation: The Origin of New Speciation: The Origin of New Species Species I. Modes of Speciation II. Species Concepts...
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6. Speciation 2008 posted - Cause of evolution Random?...

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