The Good Quote
Open menu
Quotes
Authors
Topics
More
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
Home
Authors
Peter R. Grant
American
Scientist
About the author
The theory of founder effects does not explain how novel features like plumage traits arise.
Peter R. Grant,
American
Scientist
#Theory
Thus mating of females was strictly along the lines of paternal song.
Peter R. Grant,
American
Scientist
#Song
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.
Peter R. Grant,
American
Scientist
#Inheritance
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.
Peter R. Grant,
American
Scientist
#Life
#Song
#Learning
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.
Peter R. Grant,
American
Scientist
#Songs
#Population
#Song
We observe closely related species in sympatry and infer how they evolved from a common ancestor.
Peter R. Grant,
American
Scientist
Almost nothing is known from hybridization studies about the inheritance of courtship behavior of females, or of their responsiveness to particular male signals.
Peter R. Grant,
American
Scientist
#Nothing
#Courtship
#Behavior
#Inheritance
Males transmit signals in courtship through behavioral displays.
Peter R. Grant,
American
Scientist
#Courtship
Plumage features constitute a major component of courtship signals.
Peter R. Grant,
American
Scientist
#Courtship
Genes that underlie the capacity to receive, use and transmit information are the evolving properties.
Peter R. Grant,
American
Scientist
#Information
Exchange of breeding individuals between two populations tends to homogenize their gene pools.
Peter R. Grant,
American
Scientist
#Breeding
Evidence of epistasis from hybridization studies is more scarce.
Peter R. Grant,
American
Scientist
Closely related species of birds are also chromosomally similar.
Peter R. Grant,
American
Scientist
#Birds
Species can be recognized by their morphological characteristics and songs.
Peter R. Grant,
American
Scientist
#Songs
Islands are known to differ in the food supply available to ground finches, mainly seeds.
Peter R. Grant,
American
Scientist
#Food
#Islands
The independent role of morphology in mate choice is revealed by the rare instances where the usual association between song and morphology is disrupted.
Peter R. Grant,
American
Scientist
#Song
#Choice
The process of speciation is completed with the cessation of genetic exchange.
Peter R. Grant,
American
Scientist