female:male ratio in K-3 kids
sophiewi at uoguelph.ca
Thu Jan 11 14:54:31 EST 1996
Jennifer S Kassie (jkassie at uoguelph.ca) wrote:
: 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.
Two things... isn't there now some discussion about whether certain eggs
may be more receptive to X or Y sperm - so the woman's eggs may actually
some determining input? (I read this in a newspaper... so I'll happily
AND - I understand that females are more hardy right from the start, i.e.
even before birth. So IF an older uterus is not a perfect environment,
then perhaps female zygotes/fetuses will have a higher survival rate than
their male counterparts. Hence, older mothers may give birth to more
girl-children than the average. (Again, correction happily accepted...:))
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