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Page 1: Evolution of Development

Evolution of Development

Chapter 25

Page 2: Evolution of Development

The Evolutionary Paradox

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Diverse morphologies are regulated by highly conserved genes.

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Example, the Hox genes

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Developmental changes can lead to evolutionary changes

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Heterochrony

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Homeosis

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Changes in transcription factors

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Changes in signaling pathways

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One or Two Gene Mutations, New Form

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The Brassica Example

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Same Gene, New Function

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Pitx1 and the Sticklebacks

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Different Genes, Convergent Function

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Homeoplastic structures

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Gene Duplication and Divergence

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Morning glories and pigment

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Diversity of the Eyes


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