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Chapter 24 - BIO 152 Notes Chapter 24 The Origin of Species...

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BIO 152 Notes Chapter 24: The Origin of Species habitat isolation temporal isolation behavioral isolation mechanical isolation gametic isolation reduced hybrid viability – most offspring don’t make, those that do are weak and frail reduced hybrid fertility – offspring might be strong but it is sterile (donkey) hybrid breakdown – one generation can make it but the next round is sterile or feeble morphological species concept – characterizes a species by morphology (looks) *advantages – sexual or asexual, useful without information on gene flow *disadvantages – subjective, analogous structures paleontological species concept – morphology based on fossils ecological species concept – views species in terms of environmental niche autopolyploid – individual with more than two chromosome sets (from single species) allopolyploids – individual springing from two different species with more than two chromosome sets adaptive radiation – the evolution of many diversely adapted species from a common
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