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Summary. Postnatally, XO mice have approximately half as many oocytes as their XX sisters. A quantitative histological analysis of XO and XX ovaries throughout oogenesis (14
24 days post coitum) revealed that this oocyte deficiency in XO mice is due to excess atresia of oocytes at the late pachytene stage (19 days post coitum). Female mice heterozygous for a large X inversion (In(X)/X mice) were also found to have excess atresia at late pachytene. It was suggested that in XO mice it is the presence of an unpaired X chromosome, and in In(X)/X mice, the incompleteness of X chromosome pairing, which leads to this excess oocyte atresia.
A new quantitative histological procedure which was developed for the analysis of perinatal mouse ovaries is also described.
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