female:male ratio in K-3 kids

[Karyn Lynn]

Yeah, but the optimum pH for survival is different for x sperm and y sperm.
Maybe other factors that change as women age are also influential.



>Sophie Wilson (sophiewi at uoguelph.ca) wrote:
>: And I dimly remember from a biology class that as women
>: age, they are more likely to produce female babies than male babies.  Is
>: it possible that the average age of the MOTHERS might be a factor here?
>
>
>But doesn't the male (who carries both X and Y chromosomes) determine the
>sex of the baby?  Females can ONLY contribute an X chromosme.
>
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