Article Abstract:
The role of the X chromosome on pheromone production was studied using EMS mutagenesis to induce X-linked mutations in Drosophila simulans. A mutant strain was developed wherein the biosynthesis of 7-tricosene, a contact pheromone, and other hydrocarbons were reduced. The gene controlling the synthesis of 7-tricosene (7-T) was found to be kete, localized to I, 18.5, which did not to affect the ratio of 7-T:7-pentacosene, unlike a previously identified gene Ngbo. Egg-hatching and other reproductive characteristics except for courtship behaviors in both sexes were also controlled by kete.
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Article Abstract:
X-ray mutagenesis was used to generate a mitotically unstable Drosophila melanogaster chromosome, termed Dp(3;f)Th. This chromosome was the result of a reciprocal translocation involving the euchromatin tip of the left arm of chromosome three attatched to centromeric heterochromatin. Cytological observations suggest that the mitotic instability is the result of frequent nondisjunction, which may be brought about by alterations in the heterochromatin structure. Dp(3;f)Th will be a useful tool in the genetic and molecular analyses of the eukaryotic centromere.
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Article Abstract:
The brown(super Dominant) heterochromatic element in drosophila does not coalesce with the polytene chromatocenter if the distance from heterochromatin is beyond the threshold distance. Eukaryotic chromatosomes exhibit a difference between euchromatin and heterochromatin and many genes lie in euchromatin whereas most tandemly repeated sequences are in heterochromatin. Position-effect variegation is a genetic tool for studying the distinction between heterochromatin and euchromatin.
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