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Definition of Chromosome, X

Chromosome, X: The sex chromosome found twice in normal females and once, along with a Y chromosome, in normal males. The complete chromosome complement (consisting of 46 chromosomes, including the 2 sex chromosomes) is thus conventionally written as 46,XX for chromosomally normal females and 46,XY for chromosomally normal males. The X chromosome not only determines gender but also carries the genetic code for many essential functions in both males and females.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=7747
Last Editorial Review: 3/19/2012

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