The effect of X chromosome heterozygosity on the structure of the ribosomal genes in Drosophila melanogaster. |
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Authors: | A G Harford C I Zuchowski |
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Affiliation: | Division of Cell and Molecular Biology State University of New York at Buffalo Buffalo, New York 14214 USA |
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Abstract: | Sucrose gradient analysis of DNA isolated from detergent-pronase lysates of adult flies has been used to look for ribosomal genes not integrated into the DNA of the chromosome in genotypes containing various combinations of inversions having breakpoints in the proximal heterochromatin of the X chromosome. Unintegrated genes are found in females heterozygous for inversions which have one breakpoint between the nucleolus organizer and the centromere. Homozygotes and males do not have unintegrated genes. The results suggest that unintegrated ribosomal genes result from an interaction between homologues having different arrangements of the proximal heterochromatin. In addition, data from a series of stocks carrying duplications of the X heterochromatin provide independent evidence for the size of the DNA on our gradients. |
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Keywords: | To whom requests for reprints should be addressed. |
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