1. chromosome which determines the gender of a fetus. x chromosome the sex chromosome that is present in both sexes: singly in males and doubly in females; "human females normally have two x chromosomes" [syn: x chromosome]. 2. the sex chromosome that is present in both sexes: singly in males and doubly in females; "human females normally have two X chromosomes". 3. 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.
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