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 More Quotes by Peter R. Grant More Quotes From Peter R. Grant We observe closely related species in sympatry and infer how they evolved from a common ancestor. Peter R. Grant observehowrelatedcommon Closely related species of birds are also chromosomally similar. Peter R. Grant birdsalsorelatedspecies Males transmit signals in courtship through behavioral displays. Peter R. Grant behavioralthroughcourtshipsignals Species can be recognized by their morphological characteristics and songs. Peter R. Grant songsspeciescharacteristics Thus mating of females was strictly along the lines of paternal song. Peter R. Grant strictlyalonglinessong 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 rarechoiceindependentsong 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 earlylearningsonglife Genes that underlie the capacity to receive, use and transmit information are the evolving properties. Peter R. Grant genesinformationcapacityuse Exchange of breeding individuals between two populations tends to homogenize their gene pools. Peter R. Grant exchangebetweenbreedingtwo 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 newimmigrationflowsong Islands are known to differ in the food supply available to ground finches, mainly seeds. Peter R. Grant groundseedsavailablefood Plumage features constitute a major component of courtship signals. Peter R. Grant constitutemajorcourtshipsignals Evidence of epistasis from hybridization studies is more scarce. Peter R. Grant studiesmorescarceevidence 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 aboutnothinginheritancebehavior The theory of founder effects does not explain how novel features like plumage traits arise. Peter R. Grant explainhowliketheory The process of speciation is completed with the cessation of genetic exchange. Peter R. Grant completedgeneticexchangeprocess
