Time to pregnancy and sex of offspring: cohort study
نویسندگان
چکیده
منابع مشابه
Time to pregnancy and sex of offspring: cohort study.
The proportions of X and Y chromosome bearing sperms in human semen are equal, but more boys than girls are born.Male embryos and fetuses have a greater risk of attrition in utero than their female counterparts, and therefore male excess is likely to be still larger at the time of conception. It remains unexplained, however, what is responsible, presumably at some point between insemination and...
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ژورنال
عنوان ژورنال: BMJ
سال: 2005
ISSN: 0959-8138,1468-5833
DOI: 10.1136/bmj.331.7530.1437