(in humans and other mammals) a sex chromosome, two of which are normally present in female cells (designated XX) and only one in male cells (designated XY).
The largest cluster of imprinted genes in humans is the X chromosome.
In contrast to the autosomes, recombination of the X chromosome occurs only in females.
Remarkably, almost all of these traits map genetically to the X chromosome.
In most species males carry a single X chromosome and two autosomes, while females have two copies of both.
Analysis of males for most loci allowed these loci to be mapped to autosomes or the X chromosome.
Definition of X chromosome in US English:
X chromosome
nounˈɛks ˌkroʊməˌsoʊm
Genetics
(in humans and other mammals) a sex chromosome, two of which are normally present in female cells (designated XX) and only one in male cells (designated XY).