crossing-over, crossover

crossing-over, crossover
Reciprocal exchange of material between two paired chromosomes during meiosis, resulting in the transfer of a block of genes from each chromosome to its homologue. In contrast to genetic recombination (2), which is a phenotypic phenomenon, c. is genotypic. Any even number of crossing-overs between two loci will cancel out phenotypically and no recombination will occur.
- somatic crossing-over c. that occurs during the mitosis of somatic cells, in contrast to that which occurs in meiosis.
- uneven crossing-over, unequal crossing-over c. that happens when the breaks do not occur at precisely homologous points in two chromatid strands, and hence results in localized duplication of genetic material in one chromatid and complementary deletion in the other.

Medical dictionary. 2011.

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  • crossing-over — crossing over, crossover, molekularer Prozess, der in der Meiose zu Beginn des Pachytäns stattfindet und durch Austausch von Chromatidenstücken zwischen den gepaarten homologen Chromosomen zu intrachromosomaler Rekombination führt. Die gepaarten… …   Deutsch wörterbuch der biologie

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  • Crossing-over — schematische Darstellung eines Crossovers und eines Double Crossovers Die Begriffe chromosomales Crossing over (chromosomale Überkreuzung) bzw. chromosomale Rekombination bezeichnen in der Genetik einen Stückaustausch zwischen väterlichen und… …   Deutsch Wikipedia

  • Crossing-over — Enjambement (génétique) Pour les articles homonymes, voir Crossover et Enjambement. Illustration du principe d enjambement par Thomas Hunt Morgan s (1916) …   Wikipédia en Français

  • crossing over — noun the interchange of sections between pairing homologous chromosomes during the prophase of meiosis • Syn: ↑crossover • Hypernyms: ↑organic process, ↑biological process • Part Holonyms: ↑diplotene …   Useful english dictionary

  • Crossing Jordan — The cast Format Crime, Drama Created by Tim Kring Starring …   Wikipedia

  • crossover — [krôs′ō΄vər] n. 1. the act, means, or place of crossing over from one part or side, to another ☆ 2. a track by which a railroad train can be switched from one line to another ☆ 3. a person who votes for a candidate of a political party other than …   English World dictionary

  • crossover — n. 1. (genetics) the interchange of sections between pairing homologous chromosomes during the prophase of meiosis. Syn: crossing over. [WordNet 1.5] 2. a structure, such as a bridge, bearing a path for crossing over a river or highway. [PJC] 3.… …   The Collaborative International Dictionary of English

  • crossover vote — crossover crossover n. 1. (genetics) the interchange of sections between pairing homologous chromosomes during the prophase of meiosis. Syn: crossing over. [WordNet 1.5] 2. a structure, such as a bridge, bearing a path for crossing over a river… …   The Collaborative International Dictionary of English

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