Structured Summary
Abstract
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.
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Synonyms
5 entry terms
- Crossing Over
- Crossing Over, Genetic
- Crossing-Over, Genetic
- Crossing Overs
- Genetic Crossing-Over
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Aspects Covered
6 allowable subheadings
Indexed with the subheadings drug effects, ethics, genetics, immunology, physiology, radiation effects.
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Indexing Annotation
do not confuse with CROSSES, GENETIC, the result of breeding 2 varieties of the same species
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History Note
2005(1968)
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Previous Indexing
- Cytogenetics (1967)
- Genetics (1966-1967)
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AMA Style
References
- National Library of Medicine. Genetic Crossing Over. Medical Subject Headings (MeSH). 2026. Unique ID D003434. http://id.nlm.nih.gov/mesh/2026/D003434
- Genetic Crossing Over. In: Wikipedia. https://en.wikipedia.org/wiki/Chromosomal_crossover
- Genetic Crossing Over. In: Wikidata. https://www.wikidata.org/wiki/Q244145