Meaning of X CHROMOSOME

WordNet Dictionary
	Definition:		[n]  the sex chromosome that is present in both sexes: singly in males and doubly in females; "human females normally have two X chromosomes"
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	See Also:		sex chromosome
Biology Dictionary
	Definition:		A sex chromosome found in humans, fruit flies, and certain other animals where the male is the heterogametic sex. In the XY set of sex chromosomes, the female has two X chromosomes and the male has only one (and usually also a Y chromosome). In plants which use the XY system, this chromosome is female-determining.
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Glossary
	Definition:		One of the two sex chromosomes, X and Y. the larger of the two sex chromosomes. Normal females possess two X chromosomes; normal males possess one X and one Y chromosome.
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