sister chromatid exchange


sis·ter chro·ma·tid ex·change

the exchange during mitosis of homologous genetic material between sister chromatids; increased as a result of inordinate chromosomal fragility due to genetic or environmental factors. See: recombination.

sister chromatid exchange

The exchange of corresponding parts of homologous maternal and paternal chromosomes during the first meiotic division. This contributes to genetic diversity in the offspring. Synonym: crossing overSee also: exchange