View Single Post
Old
  (#34)
jujumantb is Offline
2nd Lieutenant
 
jujumantb's Avatar
 
Posts: 3,527
Join Date: Jan 2002
Location: Laguna, Beach woowow Posts: 18463
   
Default 04-30-2007, 12:06 AM

Quote:
Originally Posted by Sniper101
Quote:
Originally Posted by Jotun
Quote:
Originally Posted by Proteus
Close together is always good.

You know it's a better chance of it being a girl again if it was a girl the first time though.
not true at all. its always 50/50.

congrats nyck
True, always 50:50...just do a mendelson table

X X
y Xy Xy

X XX XX

And congrats nyck
punnett squares are better for determining genotype probability comparing dominant and recessive alleles.
its easier to think of it like this: (juju's biology lesson for the day)
all male cells have an X and Y chromosome, when our jewels make sperm, each germ cell (again, containing one X and one Y) goes through gametogenesis to make 2 sperm each. one sperm ends up with the X and one has the Y. So in theory you have 50% X carrying sperm and 50% Y carrying sperm... whichever finds the egg first determines the sex.
its cool because the extra DNA in an X chromosome actually makes the X carrying sperm HEAVIER than the Y carrying sperm. using a centrifuge, they can actually seperate the X sperm from the Y sperm in a lab so, if you want, you can basically decide the gender of your kids by telling them which batch of sperm to shove into the moms vag.


  
Reply With Quote