Definitions for "Sex chromosomes"
the X and Y chromosomes that determine a person's gender; women normally have two X chromosomes and men normally have one X and one Y
X and Y chromosomes. The 23rd pair of chromosomes in females consists of two X chromosomes (XX). The 23rd pair of chromosomes in males consists of one X chromosome and one Y chromosome (XY).
Chromosome 23; defines the sex of an individual and consists of a pair of chromosomes, XX in female and XY in the male.
Keywords:  labeled, contents, different, two, one
are those whose contents are different in the two sexes usually labeled X and Y (or W and Z), one sex has XX (or WW), the other sex has XY (or WZ).