The chromosome studies on inversion polymorphisms from Samcheonpo natural populations of Drosophila melanogaster were performed. A total of 1635 flies, 945 males and 690 females, was collected twice a year in both 1983 and 1984, in September and October. To test the gametic gene compositions in male...
The chromosome studies on inversion polymorphisms from Samcheonpo natural populations of Drosophila melanogaster were performed. A total of 1635 flies, 945 males and 690 females, was collected twice a year in both 1983 and 1984, in September and October. To test the gametic gene compositions in male ; every wild male was mated with isolined virgin females homozygous for standard sequences in all chromosomes. From each of the matings, seven of the F1 larvae being third instar state were randomly selected and dessected for salivary chromosome preparations. And, to test inversion heterozygotes only in females ; every female inseminated in nature was isolated in each vial containing culture medium. As per vial, only one of the third instar larvae was tested. In the present study, nineteen different inversions were found, all of which were paracentric only : on X-chromosomal was only one, and the others on each of the two major autosomal arms, except for the fourth chromosome. The polymorphic inversions were identified as follows : four were common cosmopolitan, three were rare cosmopolitan, and the remainders, twelve were recurrent or unique endemic inversions in which nine were new ones firstly discovered in this study. The frequency of flies carrying one or more inversions, and the mean number of inversions per fly was 0.259 and 0.358 from the male test, and 0.397 and 0.520 from the female test, respectively. The frequency order of cosmopolitan inversions was In(2R)NS > In(2L)t > In(3L)P > In(3R)P > In(3R)Mo > In(3R)C. In the present population, In(2L)t showed a trend decreasing the frequency, conversely, In(3R)Mo increasing across seasonal and annual conditions. Although the linkage disequilibrium and nonrandom association were partially detected in the second and third chromosome in the '83 samples, the present results indicate a random distribution of inversions in this population. In homozygosity test, the observed number of homozygotes for standard and inverted gene sequences did not depart from the expected, so that, no differential mortality presented between the homozygotes, for standard and inversion chromatin, and heterozygotes.
The chromosome studies on inversion polymorphisms from Samcheonpo natural populations of Drosophila melanogaster were performed. A total of 1635 flies, 945 males and 690 females, was collected twice a year in both 1983 and 1984, in September and October. To test the gametic gene compositions in male ; every wild male was mated with isolined virgin females homozygous for standard sequences in all chromosomes. From each of the matings, seven of the F1 larvae being third instar state were randomly selected and dessected for salivary chromosome preparations. And, to test inversion heterozygotes only in females ; every female inseminated in nature was isolated in each vial containing culture medium. As per vial, only one of the third instar larvae was tested. In the present study, nineteen different inversions were found, all of which were paracentric only : on X-chromosomal was only one, and the others on each of the two major autosomal arms, except for the fourth chromosome. The polymorphic inversions were identified as follows : four were common cosmopolitan, three were rare cosmopolitan, and the remainders, twelve were recurrent or unique endemic inversions in which nine were new ones firstly discovered in this study. The frequency of flies carrying one or more inversions, and the mean number of inversions per fly was 0.259 and 0.358 from the male test, and 0.397 and 0.520 from the female test, respectively. The frequency order of cosmopolitan inversions was In(2R)NS > In(2L)t > In(3L)P > In(3R)P > In(3R)Mo > In(3R)C. In the present population, In(2L)t showed a trend decreasing the frequency, conversely, In(3R)Mo increasing across seasonal and annual conditions. Although the linkage disequilibrium and nonrandom association were partially detected in the second and third chromosome in the '83 samples, the present results indicate a random distribution of inversions in this population. In homozygosity test, the observed number of homozygotes for standard and inverted gene sequences did not depart from the expected, so that, no differential mortality presented between the homozygotes, for standard and inversion chromatin, and heterozygotes.
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