Peter R. Grant - Quotes

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Males transmit signals in courtship through behavioral displays. ---->>>

Plumage features constitute a major component of courtship signals. ---->>>

Thus the genetic basis to the origin of bird species is to be sought in the inheritance of adult traits that are subject to natural and sexual selection. ---->>>

Closely related species of birds are also chromosomally similar. ---->>>

Evidence of epistasis from hybridization studies is more scarce. ---->>>

The process of speciation is completed with the cessation of genetic exchange. ---->>>

Almost nothing is known from hybridization studies about the inheritance of courtship behavior of females, or of their responsiveness to particular male signals. ---->>>

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. ---->>>

The theory of founder effects does not explain how novel features like plumage traits arise. ---->>>

We observe closely related species in sympatry and infer how they evolved from a common ancestor. ---->>>

Thus mating of females was strictly along the lines of paternal song. ---->>>

Exchange of breeding individuals between two populations tends to homogenize their gene pools. ---->>>

Islands are known to differ in the food supply available to ground finches, mainly seeds. ---->>>

Species can be recognized by their morphological characteristics and songs. ---->>>

Genes that underlie the capacity to receive, use and transmit information are the evolving properties. ---->>>

The divergence of songs in the new population away from those in the progenitor population would only be prevented if these processes were balanced by repeated immigration and subsequent breeding: song flow. ---->>>

The independent role of morphology in mate choice is revealed by the rare instances where the usual association between song and morphology is disrupted. ---->>>

Biography

Nationality: American
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Occupation: Scientist
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