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NAL Agricultural Thesaurus
U.S. Department of Agriculture

Concept Breadcrumbs

Fields of Study > cell biology > cytogenetics > crossing over
Fields of Study > genetics > cytogenetics > crossing over
Fields of Study > genetics > molecular genetics > genetic recombination > crossing over
Preferred Term:

crossing over

Definition:
The reciprocal exchange of segments at corresponding positions along pairs of homologous chromosomes by symmetrical breakage and crosswise rejoining forming cross-over sites 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.
Concept Schemes:
NALT Core
Broader Concept:
cytogenetics, genetic recombination
Entry Terms:
  • chiasma frequency
  • sister chromatid exchange
URI:
https://lod.nal.usda.gov/nalt/24805
Download this Concept:
RDF/XMLCreated 2006-01-19, last modified 2017-08-17
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