Exchange of breeding individuals between two populations tends to homogenize their gene pools.
More Quotes from Peter R. Grant:
The theory of founder effects does not explain how novel features like plumage traits arise.Peter R. Grant
We observe closely related species in sympatry and infer how they evolved from a common ancestor.
Peter R. Grant
Plumage features constitute a major component of courtship signals.
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To summarize, the particular song a male sings, and the behavioral responses of females to song and morphological signals, are not genetically inherited in a fixed manner but are determined by learning early in life.
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Islands are known to differ in the food supply available to ground finches, mainly seeds.
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Almost nothing is known from hybridization studies about the inheritance of courtship behavior of females, or of their responsiveness to particular male signals.
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