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crossing-overcrossing-over (ger.)

  • The formation of a genotype exhibiting characters derived from both parents when the characters are known to be linked; hence also, the interchange of segments between chromatids of homologous pairs of chromosomes which causes this breakdown of linkage. (OED 2011)

    In certain combinations, the relation between linkage and breaking of the linkage (‘crossing-over’ as we shall call it) is shown at once.

    Morgan, T.H. & Cattell, E. (1912). Data for the study of sex-linked inheritance in Drosophila. J. exper. Zool. 13, 79-101: 79.


    crossing over An exchange of corresponding segments between chromatids of homologous chromosomes during meiosis, rarely also during mitosis.

    Lincoln, R.J., Boxshall, G.A. & Clark, P.F. (1982). A Dictionary of Ecology, Evolution and Systematics: 60.