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- W2186273844 abstract "Collections of D. mehogaster from Japanese populations were analyzed for enzyme and chromosomal polymorphisms. Allelic frequencies at the Adh and aGpd loci were compared with polymorphic inversion ( InC2L)B, In(2H)C ) frequencies in the second chromosome. There was a significant positive correlation between the frequencies of AdhS and In(2L)B, caused by linkage. On the other hand, inversion-free cage populations maintained in the laboratory for a long time showed considerably larger variation in the frequencies of these enzyme alleles, which seem very likely to be a consequence of random drift. Two fitness components of these enzyme and chromosomal variants were measured in two different environmental conditions; neither of the two loci showed heterozygote superiority in viability or productivity, while the inversion heterozygotes showed a superior productivity compared to the corresponding homozygotes in the fluctuating environment. These findings are compatible with the hypothesis that polymorphic isozyme genes are maintained by random drift of neutral genes in natural populations, and that association with linked inversions is a historical accident. HE controversy over whether a major fraction of protein polymorphisms in Tnatural populations is due to random drift of neutral mutations (neutral hypothesis, KIMURA and OHTA 1971) or to some kind of balancing selection (PRAKASH, LEWONTIN and HUBBY 1969; AYALA, POWELL and DOBZHANSKY 1971 ) remains unsolved, and it deserves thorough examination from every aspect. A large amount of data on allozyme variability for a wide range of organisms, especially Drosophila, is now available, and several methods of testing the hypotheses have been offered. However, only a few investigations have been undertaken to examine relationships between allozymes and polymorphic chromosome inversions. Associations between the two polymorphisms have been reported in D. pseudoobscura and D. persimilis (PRAKASH and LEWONTIN 1968, 1971; DOBZHANSKY and AYALA 1973), in D. pauani (NAIR and BRNCIC 1971), in D. willistoni (AYALA, POWELL and DOBZHANSKY 1971), in D. robusta (PRAKASH and LEVITAN 1974) and in D. melanogaster (KOJIMA, GILLESPIE and TOBARI 1970; MUKAI, METTLER and CHIGUSA 1971; MUKAI, WATANABE and YAMAGUCHI 1974; LANGLEY, TOBARI and ROJIMA 1974). The most important points in these studies are (1) what kind of natural selection is acting, (2) which" @default.
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- W2186273844 date "1977-01-01" @default.
- W2186273844 modified "2023-09-27" @default.
- W2186273844 title "NATURAL POPULATIONS OF DROSOPHZLA MELANOGASTERl" @default.
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