Puzzling Chromosome Behavior in Triploid Females of Drosophila melanogaster

Puzzling Chromosome Behavior in Triploid Females of Drosophila melanogaster Based on a particular formation of the chromocenter and trivalents in triploid Drosophila females, as well as on asynapsis in pericentromeric regions (which is a result of trivalent competition), an explanation for the increased frequency of crossing over and nonrandom segregation of the X chromosomes and autosomes in the first meiotic division is suggested. It is proposed that a delay in pairing of the pericentromeric heterochromatic chromosome regions combined into a single chromocenter leads to the following: (1) formation of the heteroduplex structures (X structures) takes more time and, consequently, their number and the frequency of crossing over in the paired chromosome regions increases; (2) in nonhomologous chromosomes, the chromocentral connections, which normally degrade in prometaphase, are retained to fulfill a function of coorientation during the first meiotic division. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Genetics Springer Journals

Puzzling Chromosome Behavior in Triploid Females of Drosophila melanogaster

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Kluwer Academic Publishers-Plenum Publishers
Copyright © 2003 by MAIK “Nauka/Interperiodica”
Biomedicine; Human Genetics
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