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Peter R. Grant
[0-0]
American
Rank: 102
Scientist
, Evolutionary Biologist
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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.
101
We observe closely related species in sympatry and infer how they evolved from a common ancestor.
102
Males transmit signals in courtship through behavioral displays.
103
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.
104
Plumage features constitute a major component of courtship signals.
105
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.
106
Evidence of epistasis from hybridization studies is more scarce.
107
Closely related species of birds are also chromosomally similar.
108
The theory of founder effects does not explain how novel features like plumage traits arise.
109
The process of speciation is completed with the cessation of genetic exchange.
110
Species can be recognized by their morphological characteristics and songs.
111
Thus mating of females was strictly along the lines of paternal song.
112
The independent role of morphology in mate choice is revealed by the rare instances where the usual association between song and morphology is disrupted.
113
Genes that underlie the capacity to receive, use and transmit information are the evolving properties.
114
Exchange of breeding individuals between two populations tends to homogenize their gene pools.
115
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.
116
Islands are known to differ in the food supply available to ground finches, mainly seeds.
117
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