Resumo

WALKER, Daniel et al. Contribución genética a la mortalidad embrionaria en 2 poblaciones de roedores no consanguíneos. Rev Cubana Invest Bioméd [online]. 1997, vol.16, n.1, pp.45-49. ISSN 0864-0300.

The percentages of recessive lethal genes that in homozygotic state cause embrionary mortality were calculated taking as a basis populations of non-consangineous rats and mice. The contribution of the recessive lethal genes was found by the difference of embrionary mortality between 2 groups with divergent matching variants: rotating system and consanguineous crossing. It was compared the number of corpora lutea, living fetuses, and reabsorptions in 200 mice and 160 rats on the 15th and 17th day of pregnancy. Only in rats there were found significant differences between both systems due to the effect of recessive lethal genes. Embrionary mortality after implantation and in general was of 5.05 and 4.25, respectively.

Palavras-chave : GENES, LETHAL [genetics]; GENES, RECESSIVE [genetics]; SEX BEHAVIOUR, ANIMAL; ANIMALS, LABORATORY [embriology].