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Author Topic: Are children of the same sex more likely in a family?  (Read 3026 times)

Offline Matthew

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Matthew asked the Naked Scientists:

newbielink:http://www.thenakedscientists.com/HTML/podcasts/ [nonactive], have heard every minute since inception via newbielink:http://www.thenakedscientists.com/HTML/podcasts/ [nonactive]! I'm only sad that I now have to wait a week between shows!

My question:  When I'm walking in a mall or store, it seems I much more often see families with kids of predominantly one sex.  For instance, it seems I'm more likely to see a 4-girl or 4-boy family than a 2-2 split. I realize many things may bias this... a mom may take only the girls out, or I more likely notice the more odd family.  Is there any basis for this. Would this more likely depend on the mom's physiology or the dad's?

What do you think?


 

Offline JnA

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Are children of the same sex more likely in a family?
« Reply #1 on: 14/07/2008 07:37:09 »
it's the y that determines the sex of a child. So it's up to (future) dads to make sure the ratio is even.

there is some evidence that men in high stress jobs produce more girls... but this needs more peer review.
 

Offline Matthew

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Are children of the same sex more likely in a family?
« Reply #2 on: 16/07/2008 02:57:22 »
Yes the Y determines sex, and this may all be wives' tales, that 1) X sperm and Y sperm behave differently, something to the fact that Y sperm are faster, but run out of steam faster, but X sperm are slower but can run longer, and 2) that the female chemistry also affects the sperm movement.  It may be vastly complex really.  I just wonder if anyone's ever done stats on predominance of one sex over mixing. 
 

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Are children of the same sex more likely in a family?
« Reply #2 on: 16/07/2008 02:57:22 »

 

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