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Meiosis: How Gambling Chromosomes Beat the Rules.

07:00 EST 2nd December 2019 | BioPortfolio

Summary of "Meiosis: How Gambling Chromosomes Beat the Rules."

Selfish centromeres exploit asymmetric female meiosis to drive non-Mendelian segregation in their favor. Using inherent differences in drive propensity between mouse chromosomes, a new study reveals how proteins that modify chromatin states and microtubule stability enable this selfish behavior.

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This article was published in the following journal.

Name: Current biology : CB
ISSN: 1879-0445
Pages: R1247-R1248

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Medical and Biotech [MESH] Definitions

The reciprocal exchange of segments at corresponding positions along pairs of homologous CHROMOSOMES by symmetrical breakage and crosswise rejoining forming cross-over sites (HOLLIDAY JUNCTIONS) that are resolved during CHROMOSOME SEGREGATION. Crossing-over typically occurs during MEIOSIS but it may also occur in the absence of meiosis, for example, with bacterial chromosomes, organelle chromosomes, or somatic cell nuclear chromosomes.

The failure of homologous CHROMOSOMES or CHROMATIDS to segregate during MITOSIS or MEIOSIS with the result that one daughter cell has both of a pair of parental chromosomes or chromatids and the other has none.

The presence in a cell of two paired chromosomes from the same parent, with no chromosome of that pair from the other parent. This chromosome composition stems from non-disjunction (NONDISJUNCTION, GENETIC) events during MEIOSIS. The disomy may be composed of both homologous chromosomes from one parent (heterodisomy) or a duplicate of one chromosome (isodisomy).

The orderly segregation of CHROMOSOMES during MEIOSIS or MITOSIS.

Metacentric chromosomes produced during MEIOSIS or MITOSIS when the CENTROMERE splits transversely instead of longitudinally. The chromosomes produced by this abnormal division are one chromosome having the two long arms of the original chromosome, but no short arms, and the other chromosome consisting of the two short arms and no long arms. Each of these isochromosomes constitutes a simultaneous duplication and deletion.

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