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X CHROMOSOME

 The X chromosome is one of the two sex-determining chromosomes found in both males and
females.
 Females have two X chromosomes, whereas males have one X and one Y chromosome.
 Both males and females retain one of their mother's X chromosomes, and females retain their
second X chromosome from their father.
 Since the father retains his X chromosome from his mother, a human female has one X
chromosome from her paternal grandmother (father's side), and one X chromosome from her
mother.

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