Females have two X sex chromosomes, and Males have one X and one Y sex chromosome. So females are XX and Males are XY. The eggs a female produces will always have one X chromosome (since females are XX they can only give an X chromosome). But a males sperm can either carry the X chromosome or the Y chromosome. So when a sperm unites with an egg, depending on whether the sperm is X or Y, the offspring will become XX (female) or XY (male). Sex is always determined by the male's sperm as females only contribute an X chromosome.
__________________ ~Magnifique Yorkies~
Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue. |