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MUTATION AS A BASIS FOR RACIAL AND SPECIFIC
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adaptive allelomorphs allopolyploids ancestral animals autosomes backcross bivalents breeding cells cent characteristics characters chromo chromosomal changes chromosome numbers chromosome pairing colonies color Crepis cross cytological Datura diploid distribution Dobzhansky Drosophila melanogaster Drosophila pseudoobscura effects eggs environment evolution evolutionary experimental fact females fertile Fj hybrid formation forms gametes gene arrangement gene combinations gene frequencies gene mutation genetic genic genotype genus geographical races give rise groups haploid hereditary heterozygotes heterozygous homologous homozygotes homozygous hybrid sterility hybrids individuals inheritance interbreeding intersexes interspecific hybrids inversions isolating mechanisms known latter lethal males meiosis meiotic division miranda morphological mutant genes mutation rates natural selection Nicotiana normal number of chromosomes observed offspring organisms origin phenotype physiological plants pollen polyploid population produce race racial Raphanobrassica recessive sexual similar strains studied Sturtevant tetraploid theory third chromosome Timofeeff-Ressovsky tion translocation triploid univalents variability variation viability wild type X chromosome zygotes