[A cytogenetic study of the bone marrow cells from the 1st-generation offspring of irradiated monkeys]

Genetic structure was studied in cells of F1 posterity whose parents had survived irradiation exposure (2.2-6.6 Gy) 6-13 years ago. In juvenile monkeys (F1) aged from 1.5 to 2.5 years the frequency of aberrations exceeded reliably the spontaneous levels but was considerably lower than this in their irradiated parents. Chromosome aberration types coincided with those of the control ones. The changes revealed in the bone marrow cells of the posterity from irradiated individuals can be regarded as an intensive spontaneous mutational process.