Abstract
MOST cytological studies of chiasma distribution in higher plants and animals are limited to qualitative statements on the pattern of chiasma distribution along bivalents. A few quantitative studies exist, however, based on detailed measurements of chiasma positions along the extended diplotene bivalents of grasshopper and locust spermatocytes1–3. These studies differ in certain respects but agree in concluding that chiasma formation or at least chiasma determination (assuming that the determination of sites for exchange is separable from exchange itself4) occurs sequentially along bivalents. To this extent these studies largely endorse the view originally proposed by Mather5,6 which was inferred from the property of chiasma interference and from observations on the frequencies of crossing over in different chromosome regions of Drosophila melanogaster.
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JONES, G. Is chiasma determination sequential?. Nature 250, 147–148 (1974). https://doi.org/10.1038/250147a0
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DOI: https://doi.org/10.1038/250147a0
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