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Descriptor English: Crossing Over, Genetic
Descriptor Spanish: Intercambio Genético
Descriptor entrecruzamiento genético
Entry term(s) entrecruzamiento cromosómico
Scope note: Intercambio recíproco de segmentos en posiciones correspondientes de pares de CROMOSOMAS homólogos por rotura simétrica y reagrupamiento cruzado formando sitios de entrecruzamiento (UNIONES HOLLIDAY) que se resuelven durante la SEGREGACIÓN CROMOSÓMICA. El entrecruzamiento ocurre típicamente durante la MEIOSIS pero también puede ocurrir en ausencia de meiosis, por ejemplo, con los cromosomas bacterianos, genes de los orgánulos o en los cromosomas nucleares de células somáticas.
Descriptor Portuguese: Troca Genética
Descriptor French: Crossing-over
Entry term(s): Crossing Over
Crossing Overs
Crossing-Over, Genetic
Genetic Crossing Over
Genetic Crossing-Over
Tree number(s): G05.728.615.200
RDF Unique Identifier: https://id.nlm.nih.gov/mesh/D003434
Scope note: 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.
Annotation: do not confuse with CROSSES, GENETIC, the result of breeding 2 varieties of the same species
Allowable Qualifiers: DE drug effects
ES ethics
GE genetics
IM immunology
PH physiology
RE radiation effects
Previous Indexing: Cytogenetics (1967)
Genetics (1966-1967)
Public MeSH Note: 2005; see CROSSING OVER (GENETICS) 1968-2004
History Note: 2005(1968)
Entry Version: CROSSING OVER GENET
Related: Chromosome Pairing MeSH
Pachytene Stage MeSH
Sister Chromatid Exchange MeSH
DeCS ID: 3451
Unique ID: D003434
Documents indexed in the Virtual Health Library (VHL): Click here to access the VHL documents
Date Established: 1968/01/01
Date of Entry: 1999/01/01
Revision Date: 2016/06/17
Crossing Over, Genetic - Preferred
Concept UI M0005351
Scope note 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.
Preferred term Crossing Over, Genetic
Entry term(s) Crossing Over
Crossing Overs
Crossing-Over, Genetic
Genetic Crossing Over
Genetic Crossing-Over



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