Definitions for x chromosome
Random House Webster's College Dictionary
a sex chromosome of humans and most mammals that determines femaleness when paired with anotherX chromosome and that occurs singly in males.
Ref: Compare Y chromosome.
Origin of 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"
A mammalian sex chromosome. Cells of females have a pair of X chromosomes while cells of males have an X and a Y.
U.S. National Library of Medicine
The female sex chromosome, being the differential sex chromosome carried by half the male gametes and all female gametes in human and other male-heterogametic species.
Use the citation below to add this definition to your bibliography:
"x chromosome." Definitions.net. STANDS4 LLC, 2013. Web. 22 May 2013. <http://www.definitions.net/definition/x chromosome>.