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Speciation (Gene Variation (Meiosis (Production of Gamete Cells- Ova &…
Speciation
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Terms in Speciation
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Species (Group of individuals that can interbreed under natural conditions and produce fertile offspring)
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Evidence of Evolution
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Comparative Anatomy
Homologous Structures: Same basic structures adapted for different uses in different species, such as the forelimb
Analogous Structures: Structures adapted for a similar use, but not from the same evolutionary origin
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- Mutations (Environmental Mutagens)
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Patterns of Evolution
Divergent Evolution- Evidence "Homologous Structures" Ancestral species diverges (splits) into two or more distinct species. Gene flow blocked, results in differentiation via genetic drift and natural selection
Adaptive Radiation: New species evolve over a shortened period of time from a common ancestor- catastrophic event or unexploited habitats
Convergent Evolution- Evidence "Analogous Structures" Similar traits arise in two or more unrelated species. Unrelated species have similar selection pressures, esp niche
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