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The effect of temperature on meiotic loss of the Y chromosome in the male Drosophila



The effect of temperature on meiotic loss of the Y chromosome in the male Drosophila



Genetics 48: 133-138



When males of the composition sc4-sc8/sc8.Y are raised at 26[degree]C and 18[degree]C, and then tested at 26[degree]C, the sc8.Y is lost with a markedly higher frequency at the higher than at the lower temperature. A question raised was whether this difference is the result of an increase in the frequency of synapsis between X and Y at the cooler temperature. Experiments were carried out testing the response of the univalent XPYL.yS in XD/IV; XpYL-Ys/0 Bar-Stone males to the two temperatures. The behavior of this univalent paralleled that of the sc8.Y showing appreciably greater loss at the higher than at the lower temperature. Thus, an explanation which would account for the behavior of the sc8.Y requires no special assumptions about synapsis. The suggestion is made that a Y chromosome undergoes meiotic loss at a high or a low rate independent of synapsis.

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Accession: 025764936

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PMID: 14003687


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