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Lec%2074%20Speciation%2009

Lec%2074%20Speciation%2009 - Speciation What does...

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4/10/09 1 Speciation What does “allopatric” mean? A. it’s the way an Australian greets someone named Patrick B. speciation over a relatively short time period, in evolutionary terms C. speciation that occurs as burst from a single ancestor species D. speciation in geographically separate ranges E. speciation in geographically overlapping ranges What does “allopatric” mean? A. it’s the way an Australian greets someone named Patrick B. speciation over a relatively short time period, in evolutionary terms C. speciation that occurs as burst from a single ancestor species D. speciation in geographically separate ranges E. speciation in geographically overlapping ranges * What is a species? Biological species concept: members of populations that actually or potentially interbreed in nature. White-tail deer ( O. virginianus ), native to most of N. America. Antlers forked in series. Mule deer ( Odocoileus virginianus ), western U.S.). Larger ears. Antlers forked in pairs. different species may be very similar in appearance. Interbreeding keeps the species intact by gene flow But can genes really flow over long distances. Often, yes. Biological species concept: members of populations that actually or potentially interbreed in nature.
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4/10/09 2 Reproductive barriers: what keeps species apart reproductively?
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