posted on Sep, 6 2012 @ 11:54 PM
reply to post by OccamAssassin
We all start off as females, then those predisposed to, will change (I think its YY for females and XY for males) one Y to an X and will become
Oops... you got that one backwards...
It's XX for women, and XY for men....
The Y chromosome pretty much codes for the testes, and not much else.
Your chromosomes are set during fertilization, actually, and do not change in the womb, during gestation at any point.
What DOES change, is the type of hormones that your body produces... and these hormones effect how our cells pattern themselves into various
tissues and such.
Vertebrate embryos start out in the typical female hormone pattern, because it is essentially the default, but this changes during the second
trimester (I think) for males, as the gonads begin to develop, which changes the overall hormone balance within the gestating fetus.
This change in hormones helps cause the associated changes within the developing tissues (Brain, Gonads, Skeleton, etc) to be more male than
edit on 6-9-2012 by ErtaiNaGia because: (no reason given)