[The effect of chronic ionizing radiation at low doses on a number of reproductive indices in CC57W/Mv mice from an experimental Chernobyl population]. / Vliianie khronicheskogo ioniziruiushchego oblucheniia v malykh dozakh na riad pokazatelei reproduktivnoi funktsii myshei linii CC57W/Mv iz chernobyl'skoi éksperimental'noi populiatsii.

The effects of low doses of environmental ionizing radiation on reproductive functions of seven generations of CC57W/Mv mice from Chernobyl experimental population has been investigated. A decrease in the number of litters per female during reproductive period, the number of newborn animals per litter, and an increase in the postnatal mortality during the first month of life were shown. These effects are due to the stable disorders of parental reproductive system and the high level of in-vivo preimplantation deaths in F1--F7 generations of CC57W/Mv mice from the Chernobyl experimental populations.

[The comparative analysis of the mutational variability and instability of the thi, Bd strains induced by exogenous viral DNA in Drosophila melanogaster]. / Sravnitel'nyi analiz mutatsionnoi izmenchivosti i nestabil'nosti linii thi, Bd, indutsirovannykh ékzogennoi virusnoi DNK, u Drosophila melanogastrer.

Frequency of reversions to wild type varies for thi and its derivatives from 10(-2) to 10(-5). A broad spectrum of mutations arises in thi alleles and thi+ revertants. Among them there are r, w, Bd and new mutations causing scalloped wings with thickened veins in all the autosomes. In the offspring of a Cy/thi 1 male a fly is found carrying a thi 1 allele in the Cy chromosome; this is not caused by crossing-over, but probably by a transposition. Mutations in the thi, Bd strains and their derivatives are supposed to be caused by small insertion. The nature of these insertions are under discussion.