Medical Definition of sex chromosome
: a chromosome (as the X chromosome or the Y chromosome in humans) of a sexually reproducing eukaryotic organism that is directly concerned with the inheritance of sex, that contains the genes governing the inheritance of various sex-linked and sex-limited characteristics, and that is represented differently in the two sexes either by being present in one and not the other or by being present a different number of times in one sex compared to the other—called also
Seen and Heard
What made you want to look up sex chromosome? Please tell us where you read or heard it (including the quote, if possible).