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10.3

gene pools and speciation

Essential Idea:  Gene pools change over time.

Nature of Science:  Looking for patterns, trends, and discrepancies: patterns of chromosome number in some genera can be explained by speciation due to polyploidy.

APPLICATIONS & SKILLS:

  • Application:  Identifying examples of directional, stabilizing, and disruptive selection.

  • Application:  Speciation in the genus Allium by polyploidy.

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UNDERSTANDINGS:

  • 10.3.U3  Reproductive isolation of populations can be temporal, behavioral, or geographic.

  • 10.3.U4  Speciation due to divergence of isolated populations can be gradual.

  • 10.3.U5  Speciation can occur abruptly.

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