The distribution of x-ray induced crossovers from Curly inversion heterozygotes of drosophila melanogaster females.
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چکیده
منابع مشابه
A Cytogenetic Study of Crossing over in Inversion Heterozygotes of Drosophila Melanogaster.
HE recombinant off spring of Drosophila melanogaster females having free X T chromosomnls heterozygous for a long inversion are limited to even multiple crossover types. But from inversion heterozygotes in which the two X chromosomes are attached at their centromeric ends (= tandem metacentric compound X chromosome), single crossovers are frequently recovered. The synaptic configurations of the...
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FRIESEN (1936) induced crossing over in Drosophila males by X rays and found that most of the exchanges were in a preferred region, the complementary crossover classes were very unequal, and the percent recombination varied greatly from individual to individual. According to him, the data 'were sufficient to demonstrate the occurrence of spermatogonial crossing over. WHITTINGHILL (1937) found t...
متن کاملAn analysis of regional constraints on exchange in Drosophila melanogaster using recombination-defective meiotic mutants.
The frequency of crossing over per unit of physical distance varies systematically along the chromosomes of Drosophila melanogaster. The regional distribution of crossovers in a series of X chromosomes of the same genetic constitution, but having different sequences, was compared in the presence and absence of normal genetically mediated regional constraints on exchange. Recombination was exami...
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Background: In this study, the toxicity of the different xenobiotics was tested on the fruit fly Drosophila melanogaster model system. Methods: Fly larvae were raised on food supplemented with xenobioticsat different concentrations (sodium nitroprusside (0.1-1.5 mM), S-nitrosoglutathione (0.5-4 mM), and potassium ferrocyanide (1 mM)). Emergence of flies, food intake by larvae, and pupation h...
متن کاملExchange within heterozygous inversions in Drosophila melanogaster.
The exchange behavior of non-attached, whole arm, X chromosome inversions was reexamined using nondisjunction in XXY females as an indirect measure of the frequency of nonexchange tetrads. Crossing over is quite normal in these inversion heterozygotes and is independent of the arrangement of the basal heterochromatin.
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عنوان ژورنال:
- Proceedings of the National Academy of Sciences of the United States of America
دوره 36 10 شماره
صفحات -
تاریخ انتشار 1950