Bivalent behavior in Drosophila melanogaster males containing the In(1)sc 4Lsc8RX chromosome |
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Authors: | Jeffrey G. Ault Hsiu-Ping P. Lin |
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Affiliation: | (1) Department of Zoology, Arizona State University, 85287 Tempe, AZ, USA;(2) Present address: Department of Zoology, Duke University, 27706 Durham, NC, USA |
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Abstract: | The sex chromosome bivalent was examined in Drosophila melanogaster males possessing the In(1)sc4Lsc8R X chromosome. Three-dimensional reconstructions from electron micrographs of serially cut thin sections were made. A large proportion of the kinetochores of In(1)sc4Lsc8R/Y bivalents did not face opposite poles during metaphase I and anaphase I. This suggests that In(1)sc4Lsc8R/Y bivalents may have difficulty achieving bipolar stability. Delay in achieving bipolar stability could contribute to the nondisjunctional behavior found in In(1)sc4Lsc8R/Y males. |
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