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Preface to the First Edition
Introduction to the Third Edition Seventh Impression
The Theory of Natural Selection 1 The theory of natural selection
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adaptive radiation alleles allometry allopolyploidy Amer animals appear basis behaviour biological birds breeding butterﬂies characters chromosomes climatic clines colour consequential correlated Darwin deﬁnite degree differentiation diploid distinct divergence Dobzhansky dominant Drosophila E. B. Ford ecological effects environment evolution evolutionary change evolved examples existence fact favourable fertility ﬁeld ﬁnd ﬁrst ﬁsh Fisher forms function further gene-complex genes genetic genus geographical gradient groups habitat Haldane higher human Huxley hybrid important increase insects instance interbreeding intergradation isolation large number Lepidoptera major mammals Mayr mechanism meiosis melanic mendelian modiﬁcations morphological mutations natural selection normal occur organisms origin orthogenesis phenotypic physiological plants polymorphism polyploidy population preadaptation Proc produced progress R. A. Fisher races range recent recessive recombination regarded regions relative reproduction restricted result Sewall Wright signiﬁcance similar speciation species speciﬁc subspecies taxonomic tetraploid tion trends types variability variation various Zool