Abstract
The structure of a diplotene bivalent with one chiasma, as seen in the microscope, can be interpreted according to either the chiasma-type theory or the two-plane theory (Fig. 18.1; Darlington, 1937; Jones, 1987). The latter assumes that the paired chromatids on the distal side of a chiasma belong to different chromosomes, one paternal and one maternal. According to the chiasma-type theory, two maternal chromatids and two paternal chromatids remain paired on both sides of the chiasma: in other words, a chiasma is the result of crossing-over. Observations of normal bivalents do not allow one to distinguish between these two possibilities.
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Therman, E., Susman, M. (1993). Details of Meiosis. In: Human Chromosomes. Springer Study Edition. Springer, New York, NY. https://doi.org/10.1007/978-1-4684-0529-3_18
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DOI: https://doi.org/10.1007/978-1-4684-0529-3_18
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