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Macroevolution (Developmental genes (Changes that may occur to change…
Macroevolution
Developmental genes
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Tend to be highly conserved because they are so important for function (any major change to the genes kills the embryo)
Big example: Homeotic genes- the master regulatory genes that control other genes that determine basic body patterns
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Heterochrony is an evolutionary change in the rate/timing of development events which may also alter timing or reproductive development relative to development of non-reproductive organs
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Adaptive radiation
A period of evolutionary change in which groups of organisms form new species with adaptations that allow them to fill different niches
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Regional scale example is seen in divergence by natural selection in ancestral tarweed found in Hawaii--new organisms reach their new locations with little competition causing them to diverge by natural selection
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