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HEREDITY AND MUTATION
MUTATION IN POPULATIONS
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adaptive peaks adaptive value alleles allopatric animals autosomes backcross bacteriophage biological bivalents breeding cells changes Chapter chro chromo chromosome pairing color cross differentiation diploid diversity Dobzhansky dominant Drosophila melanogaster Drosophila pseudoobscura ecological effects eggs environment evolution evolutionary experimental females fertile flies forms gametes gene arrangements gene combinations gene exchange gene frequencies genetic drift genic genotypes geographic groups habitats heterozygotes homozygotes homozygous human individuals insects interbreeding intersexes inversions inviable isolating mechanisms lethals males mating Mayr meiosis Mendelian populations miranda morphological mosomes mutability mutant genes mutation rates natural populations natural selection normal observed occur offspring organisms parental species percent persimilis phenotypic physiological plants polymorphism polyploid populations of Drosophila produce progeny races recessive relatively reproductive isolation semilethal sexual isolation similar Stebbins strains structure studied sympatric systematists temperature tetraploid theory third chromosome Timofeeff-Ressovsky tion traits translocation types univalents variability variations viability virilis willistoni X chromosome