Ch 24 - The Origin of Species (1 slide per page)-1

Eastern meadowlark figure 242 campbell et al 9th ed

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Unformatted text preview: ent? Eastern meadowlark Figure 24.2 (Campbell et al 9th ed) Western meadowlark 12 12 Problems with the MSC Species may look alike but never interbreed since they don’t occur together Western scrub-jay Florida scrub-jay 14 14 Problems with the MSC Species may look alike and occur together but never interbreed American Crow, (Corvus brachyrhynchos) Fish Crow (Corvus ossifragus) 15 15 Problems with the MSC Sexual dimorphism Males & females appear very different Eclectus Parrot, Eclectus roratus 17 17 Biological Species Concept • Population or group of populations whose: • members can potentially interbreed & have fertile offspring • can’t “successfully” breed w/ members of other populations Common pheasant, Phasianus colchicus Blue-winged mountain tanager Black-chinned mountain tanager 23 23 Biological Species Concept Main idea: reproductive isolation leads to lack of genetic flow 24 24 Reproductive Barriers Prevent successful breeding between organisms • Prezygotic – no zygote forms – Impede mating – hinder fertilization • Postzygotic – zygote does not survive or is infertile – Prevent hybrid zygote from developing into fertile...
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This note was uploaded on 02/12/2014 for the course BIOLOGY 2011 taught by Professor Woo during the Fall '10 term at University of Central Florida.

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