Genetics. The rearrangement of genetic material, or of the corresponding heritable characteristics, by natural or artificial means; esp. the…

Cytology. Plural chiasmata. The exchange of segments of chromatids during nuclear division.

the formation of a genotype exhibiting characters derived from both parents when the characters are known to be linked; hence also, the…

Biology (a) An instance of the process of crossing-over (see crossing-over n. at crossing, n. compounds 2). (b) An individual having characters…

Various scientific and technical senses. Genetics. The action of one crossover in reducing or increasing (originally only reducing) the chance of a…