Some time in the nineties (1998 provides a terminus ad quem because that\'s when

Question

Some time in the nineties (1998 provides a terminus ad quem because that's when I joined the internet, and I relayed the information to a cyber-friend in America shortly after that) I heard an item on a news bulletin or in a BBC compilation of recent research in Nature to the effect that a study had shown how men with a high level of testosterone have a tendency to produce predominantly female offspring. No biochemical reason was adduced so far as I recall, but the claim was based on a survey of Royal Marine progeny. Perhaps the finding has been discredited since you don't seem to have heard of it, but if it hasn't, it suggests that there IS a way to determine the gender of a child in advance of conception. Marry a Marine if you want a girl, and an interior decorator if you want a boy!

Explanation / Answer

The sex of a baby is determined by whether the egg which is carrying an X-chromosome is fertilised by a sperm carrying another X which will produce a girl or one carrying a Y-chromosome which produces a boy. So, in that sense, it

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