An X chromosome is one of an identical pair of chromosomes found in a woman's cells, or one of a non-identical pair found in a man's cells. X chromosomes are associated with female characteristics. Compare Y chromosome. a type of chromosome that exists in pairs in female cells, and together with a Y chromosome in male cells
One of the two "sex chromosomes" in humans, and the location of the factor VIII and IX genes Females have two X chromosomes, and males have one X and one Y chromosome