Udalova L D
Biull Eksp Biol Med. 1979 Oct;88(10):473-4.
Sex ratio and postimplantation mortality were studied in (CBAXC57BL)F1, CBA and C57BL mouse embryos. It has been shown that female fetuses are predominant in the progeny of hybrid mice. In CBA and C57BL mice the sex distribution was 1 : 1. The disorder in the balanced sex ratio in the progeny of hybrid mice confirms a conclusion on the effect of the mouse genetic features on the sex distribution in embryos. Equal sex ratio in CBA and C57BL mice indicates the absence of selective mortality in the embryos of either sex during embryogenesis.
在（CBA×C57BL）F1、CBA和C57BL小鼠胚胎中研究了性别比例和植入后死亡率。结果表明，杂种小鼠后代中雌性胎儿占主导地位。在CBA和C57BL小鼠中，性别分布为1:1。杂种小鼠后代性别比例失衡证实了关于小鼠遗传特征对胚胎性别分布有影响的结论。CBA和C57BL小鼠中性别比例相等表明在胚胎发育过程中两性胚胎均不存在选择性死亡。
