chromatid interference

chromatid interference

the restriction of CROSSING OVER between nonsister CHROMATIDS during prophase I of MEIOSIS, due to a prior CHIASMA having already formed. Such interference produces a reduction in the amount of RECOMBINATION and hence an underestimate of the map distance between genes linked on the same chromosomes.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005