Gillies, C. B. School of Biological Sciences, University of Sydney, Sydney, Australia.
- Molecular mechanisms
- Ultrastructural cytology
- Sex chromosomes
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The process whereby one or more gene alleles present in one chromosome may be exchanged with their alternative alleles on a homologous chromosome to produce a recombinant (crossover) chromosome which contains a combination of the alleles originally present on the two parental chromosomes. Genes which occur on the same chromosome are said to be linked, and together they are said to compose a linkage group. In eukaryotes, crossing-over may occur during both meiosis and mitosis, but the frequency of meiotic crossing-over is much higher. This article is concerned primarily with meiotic crossing-over. See also: Allele; Chromosome; Gene; Linkage (genetics)
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