11-10Speciation_Lecture 29

11-10Speciation_Lecture 29 - Speciation: the origin of new...

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5/10/11 Speciation : the origin of new species from parental species Millions of species occupy Earth now (millions more likely existed in the past & have become
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5/10/11 Species: a group of related organisms having distinctive features & that typically interbreed Equus grevyi Equus quagga
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5/10/11 Previously, we noted that disruptive adaptive radiation can generate multiple new species from a single parental species. What causes species to remain separate? Related species become different enough so that if they come into contact: 1) they don’t interbreed, or 2) don’t compete so much that they
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5/10/11 Sufficient change in allele proportions (evolution) is all that is needed to keep species distinct.
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5/10/11 Mechanisms of speciation: 1. Adaptation to different ecological situations A. Allopatric “other homeland” speciation Geographical barriers separate a population into two or more bits
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5/10/11 Reproductive isolation . A. Prezygotic isolating mechanisms : Geographic isolation
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This note was uploaded on 05/10/2011 for the course BIO 103 taught by Professor Geek during the Spring '11 term at Wisconsin.

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11-10Speciation_Lecture 29 - Speciation: the origin of new...

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