Walters-BSC2010-Chapter24-10

Walters-BSC2010-Chapter24-10 - Chapter 24: Speciation...

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Chapter 24: Speciation Speciation: the origin of a new species
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Lonesome George
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Will it ever change??? July 2008: 3 nests found in enclosure with George and 2 ladies (none of the 13 eggs were fertile) July 2009: 5 more eggs – also not fertile Tortoises have been in pen together for 16 years (researchers wait for hatching to look at paternity)
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Speciation When one species splits into two or more species Links microevolution (short-term, within a population) to macroevolution (long- term, no longer a single population)
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Biological Species Concept : Population (or group of populations) whose members have the potential to interbreed in nature and produce viable, fertile offspring (Ernst Mayr, 1942)
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Reproductive Isolation: Prevent interbreeding between different species (If 2 different species mate, result = hybrids ) Biological and/or geographical barriers
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Biological barriers: 1) Pre-zygotic impedes mating or hinders fertilization if mating attempted 2) Post-zygotic prevents hybrid zygotes from developing into viable, fertile adults
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Pre-zygotic barrier: 1a) Habitat isolation : 2 species live in the
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Walters-BSC2010-Chapter24-10 - Chapter 24: Speciation...

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