| Abstract: | The sex ratio and postimplantation mortality were compared for CBA and C57BL mice and (CABxC57BL)F1 hybrids. Female embryos were found to be more numerous in the progeny of the hybrids. The sex ratio of CBA and C57BL embryos is 1:1. Disturbance of the balanced sex ratio in the progeny of the hybrid mice confirms the conclusion that the genetic characteristics of these mice affect the sex distribution of the embryos. The equal sex ratio in CBA and C57BL mice points to the absence of selective mortality among embryos of either sex during embryogenesis.Department of Embryology, Institute of Experimental Medicine, Academy of Medical Sciences of the USSR, Leningrad. (Presented by Academician of the Academy of Medical Sciences of the USSR P. N. Veselkin.). Translated from Byulleten' Éksperimental'noi Biologii i Meditsiny, Vol. 88, No. 10, pp. 473–474, October, 1979. |
