female:male ratio in K-3 kids

Terry McTigue tam2731 at usl.edu
Thu Jan 11 15:23:32 EST 1996

sophiewi at uoguelph.ca (Sophie Wilson) wrote:
> Kim Cuddington (kcudding at uoguelph.ca) wrote:
> : I dimly remember something from a biology class that more human males are 
> : conceived than females, but that there is a higher attrition rate for 
> : male fetuses. Perhaps medical techniques, improved nutrition etc are 
> : helping more males survive?? Okay, maybe not!
> : Cheers,
> : Kim
> 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?

Since sex is determined by the father's contribution to the genetic
material, what could be the mechanism linking the sex ratio to the
mother's age?

More information about the Womenbio mailing list