Definitions for "X chromosome"
the larger of the two sex chromosomes. Normal females possess two X chromosomes; normal males possess one X and one Y chromosome.
the sex chromosome that is present in two copies in the homogametic sex and one copy in the heterogametic sex.
The chromosome that determines that female sex characteristics will develop in an individual. In the normal female there are two X chromosomes and in the male only one.
Keywords:  prerequisite, life
a prerequisite for life
Keywords:  linked