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        Endemic Inversions and Distribution of Their Breakpoints in a D . melanogaster Population

        류명수,백용군,민병철 한국유전학회 1984 Genes & Genomics Vol.6 No.3

        For spontaneous occurrence of chromosomal inversions, we tested 1541 haploid genomes (Chromosomes 2 and 3) from a natural population of D. melanogaster in the period from 1978 to 1981. Of a total of 41 inversion types found 6 were cosmopolitans, 34 rare endemics, and 1 common endemic. None of the rare endemics were identical to any previously reported chromosomal aberrations. Of the 35 endemic types 13 inversions were found on 2L, 9 on 2R, 6 on 3L, and 7 on 3R. A nonrandom distribution of the breakpoints on the salivary gland chromosomes was observed, with the breakpoints concentrated in certain regions. Thus, the frequent occurrence of the unique inversions at restricted regions of the chromosomes most probably derives from the existence of a kind of mutator factors, such as "hi" (Ives, 1950) or transposable controlling element. (Green, 1967) in the natural population of this species.

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