[Radiosensitivity of tumor cells as a quantitative trait with a facultative threshold manifestation].

Study in the variability and heritability of the "radiosensitivity" character in clone populations of rhabdomyosarcoma RA-2 and carcinosarcoma K10 in rats has shown a hereditary heterogeneity of the clonogenic tumour cell populations by the given character and probability of the facultative threshold display.