EVOLUTION AND GENETICS
This chapter summarizes the results of studies examining the adaptive changes in introduced populations of House Sparrows, including the classic study of natural selection by Hermon Bumpus. Clinal changes in size and sexual size dimorphism are some of the principal findings of these studies, along with the suggestion of reduced genetic variability in introduced populations (the founder effect). Genetic studies discussed include numerous isozyme studies, and more recently, the identification and characterization of several House Sparrow genes, including a period gene.
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