be missing one sex chromosome (X or Y), resulting in a (45,X) karyotype instead of the usual (46,XX) or (46,XY). This is a type of aneuploidy, and cells from the person may be said to be aneuploid with a (diploid) chromosome complement of 45.

Etymology

The term ploidy is a back-formation from haploidy and diploidy. "Ploid" is a combination of Ancient Greek -????? (-plóos, "-fold") and -????? (-eides), from ????? (eîdos, "form, likeness"). The principal meaning of the Greek

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