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[Examination of genetic structures of sex cells of rats flown during their prenatal development on Cosmos-1514].

Male rats that were flown on Cosmos-1514 during their prenatal days 13 through 18 were investigated. The animals were sacrificed when they reached sexual maturity. Preparations were made of their testes for cytogenetic analysis: spermatocytes were at the stages of diakinesis--metaphase 1. The flown rats had 0.9% reciprocal translocations while the ground-based synchronous controls showed 0.5%. Exposure to space flight factors in combination had a mutagenic effect on gonocytes. However, the adverse effect of microgravity per se was not demonstrated unambiguously.