Abstract
Chiasma distribution at diplotene in Schistocerca gregaria males can be taken to indicate the positions at which crossing over occurred prior to diplotene since chiasma terminalisation is entirely absent. Analysis of chiasma frequency and position leads to a model for the mechanism controlling distribution which has three main components. — i) The bivalents vary in length between cells due to unknown factors and increase in bivalent length leads to an increase in chiasma frequency. — ii) Within bivalents chiasma initiation is sequential from telomere to centromere with the first chiasma usually forming close to the telomere. — iii) Interference operates with the same polarity and determines a distance within which crossing over is precluded.
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Fox, D.P. The control of chiasma distribution in the locust, Schistocerca gregaria (Forskål). Chromosoma 43, 289–328 (1973). https://doi.org/10.1007/BF00294277
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DOI: https://doi.org/10.1007/BF00294277