myversionsinglespaced - 3) 24 INTRO, 24.1, 24.2 (472-486)...

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3) 24 INTRO, 24.1, 24.2 (472-486) A. Distinguish between anagenesis (phyletic evolution) and cladogenesis. B. Describe the barriers that tend to prevent interbreeding between species once speciation has taken place (reproductive isolation). prezygotic: habitat, behavioral, temporal, mechanical, and gametic isolation postzygotic: reduced hybrid viability or fertility, hybrid breakdown C. Define and differentiate among the following alternative species concepts: morphologica l paleontological ecological phylogenetic Relate these to the basis of the biological species concept . Why is it difficult to define the idea of species? D. Describe how allopatric speciation takes place. geographic isolation E. Describe what happens in sympatric speciation . autopolyploidy allopolyploidy F. Use the example of the “silversword alliance” to explain adaptive radiation and the evidence for it. G. Explain Stephen J Gould’s and Niles Eldredge’s theory of punctuated equilibrium . What evidence led Gould and Eldredge to this theory? H. Discuss the way small changes in developmental genes can produce large changes in organisms’ phenotypes. allometric growth paedomorphosis heterochrony homeosis A) Anagenesis -The accumulation of heritable changes that gradually transforms one species into a different species with different characteristics. Cladogenesis -the branching evolution, in which many new species arise from a population that buds from a parent species. -Basis for biological diversity by increasing the number of speies. -Gene pool splits into 2 or more gene pools. B) Barriers -Reproductive Isolation – barriers that impede members of 2 species form producing viable fertile hybrids. -1 barrier does not block all genetic exchange between species, many barriers together can effectively isolate a species’ gene pool from that of another. -Barriers are classifid by whether or not they contribute to reproductive isolation before or after fertilization. -
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This note was uploaded on 10/02/2011 for the course CHEM 210 taught by Professor Clay,m during the Summer '08 term at San Mateo Colleges.

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myversionsinglespaced - 3) 24 INTRO, 24.1, 24.2 (472-486)...

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