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"The theory of founder effects does not explain how novel features like plumage traits arise."
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"Never abandon a theory that explains something until you have a theory that explains more."

"Of thousands of others, nearer the centre of the explosion, there was no trace. They vanished. The theory in Hiroshima is that the atomic heat was so great that they burned instantly to ashes - except that there were no ashes."

"Theories crumble, but good observations never fade."

"A theory can be proved by experiment; but no path leads from experiment to the birth of a theory."

"My theory is this; I'm not a political songwriter. I'm an honest songwriter."

"Without a revolutionary theory there cannot be a revolutionary movement."

"Without revolutionary theory there can be no revolutionary movement."
Explore more quotes by 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."

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

"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."

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

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

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