<unk>  (also called de la Chapelle<unk> , for a researcher who characterized it in 1972) is a rare sex chromosomal disorder. Usually it is caused by unequal crossing over between X and Y chromosomes during meiosis.
It is less common than Klinefelter<unk> .
XX male syndrome
Turner syndrome
Triple X syndrome
Kallmann syndrome
Androgen insensitivity syndrome
Wolman disease
Down syndrome
Kostmann syndrome