XY chromosomes are MALE, and XX are FEMALE.
Another fun fact; XX chromosomes are bigger and stronger than XY, but XY's are faster swimmers.
True story.
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Of course there are exceptions to every rule
Blessings to all and,
May all be well with you ^_^
When I wanted tomboy sisters we went to play in mud and dirt and played with my dad's old GI JOE's. My youngest will pick up a dead mouse- with a shovel- while my other sister and I won't even look at it.
my examples are kind of crappy but I know what I'm trying to say...
http://www.youtube.com/watch?...
It can seem that boys get into more physical snafus than girls, but there's always girls that defy the norm. Or maybe girls are just more careful? Who really knows?
Women simply are lucky to have 2 X chromosomes. By having 2, we get "Barr Bodies" A Barr body is the inactivated X chromosome that is usually found in the nuclei of female somatic cells. It's one of the reasons women are less likely to express inherited genetic diseases. The "normal" X chromosome will "mask" the mutated X chromosome.
(It can also occur in males when there is an abnormality and the male is XXY instead of the normal XY (Klinefelter's syndrome) With this, male somatic cells also contain a Barr body. However, having 2 X chromosomes for a male tends to lead to other complications like sterility.)