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Peter R Grant QUOTES / QUOTATIONS
A major task for evolutionary biologists is to explain the origin of biodiversity.
Quotation of Peter R Grant
Almost nothing is known from hybridization studies about the inheritance of courtship behavior of females, or of their responsiveness to particular male signals.
Quotation of Peter R Grant
Although speciation is ecologically driven, reproductive (mating) interactions at secondary contact are far from irrelevant.
Quotation of Peter R Grant
Closely related species of birds are also chromosomally similar.
Quotation of Peter R Grant
Despite the evidence against reinforcement, the basis of premating isolation does not evolve entirely in allopatry.
Quotation of Peter R Grant
Evidence of epistasis from hybridization studies is more scarce.
Quotation of Peter R Grant
Exchange of breeding individuals between two populations tends to homogenize their gene pools.
Quotation of Peter R Grant
For example, an ecologist's world can make perfect sense, in the short term at least, in the absence of evolutionary considerations.
Quotation of Peter R Grant
Genes that underlie the capacity to receive, use and transmit information are the evolving properties.
Quotation of Peter R Grant
If continental speciation is promoted by temporarily insular conditions the demography and genetics of founding populations may be of importance.
Quotation of Peter R Grant
If evolutionary divergence in allopatry has been minor before the interchange, the members of the two populations are likely to treat each other as potential mates and interbreeding will ensue.
Quotation of Peter R Grant
If postmating isolation evolves in allopatry, hybridization at the sympatric stage will be lacking, or at most extremely rare and of little consequence.
Quotation of Peter R Grant
In broad outline the last stages of speciation are known, but the genetic basis to the physiological details of postmating isolation are not.
Quotation of Peter R Grant
Islands are known to differ in the food supply available to ground finches, mainly seeds.
Quotation of Peter R Grant
Males transmit signals in courtship through behavioral displays.
Quotation of Peter R Grant
Plumage features constitute a major component of courtship signals.
Quotation of Peter R Grant
Species can be recognized by their morphological characteristics and songs.
Quotation of Peter R Grant
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.
Quotation of Peter R Grant
The evolution of reproductive isolation in Darwin's finches is therefore the evolution of differences in song and in morphology.
Quotation of Peter R Grant
The independent role of morphology in mate choice is revealed by the rare instances where the usual association between song and morphology is disrupted.
Quotation of Peter R Grant
The process of speciation is completed with the cessation of genetic exchange.
Quotation of Peter R Grant
The rare interbreeding of species and the mating pattern of the hybrids provide further evidence of the importance of song in mate choice.
Quotation of Peter R Grant
The theory of founder effects does not explain how novel features like plumage traits arise.
Quotation of Peter R Grant
Thus mating of females was strictly along the lines of paternal song.
Quotation of Peter R Grant
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.
Quotation of Peter R Grant
Thus the genetics of speciation of Darwin's finches through the evolution of reproductive isolation are very different from the genetics of Drosophila as described by Dobzhansky and elaborated by many others.
Quotation of Peter R Grant
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.
Quotation of Peter R Grant
We observe closely related species in sympatry and infer how they evolved from a common ancestor.
Quotation of Peter R Grant
With rare exceptions sympatric species pair and breed conspecifically, and as a result are reproductively isolated from each other.
Quotation of Peter R Grant