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.
The X chromosome is one of the two sex-determining chromosomes in many animal species, including mammals, and is found in both males and females. It is a part of the XY sex-determination system and X0 sex-determination system. The X chromosome was named for its unique properties by early researchers, which resulted in the naming of its counterpart Y chromosome, for the next letter in the alphabet, after it was discovered later.
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.
The numerical value of x chromosome in Chaldean Numerology is: 7
The numerical value of x chromosome in Pythagorean Numerology is: 4
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"x chromosome." Definitions.net. STANDS4 LLC, 2018. Web. 21 Jan. 2018. <http://www.definitions.net/definition/x chromosome>.