The changes that cause Prader-Willi syndrome occur on the pair known as chromosome 15. The 23rd chromosome pair is designated as the sex chromosome pair This pair determines the babyâs sex: XX for a girl, XY for a boy.
(In the metric system, a milligram is a unit of weight equal to one-thousandth of a gram, and a deciliter is a unit of volume equal to one-tenth of a liter.) Muscular young or middle-aged adults may have more creatinine in their blood than the norm for the general population.
milligram. 1  metric weight unit, weight unit - a decimal unit of weight based on the gram. 2  mcg, microgram - one millionth (1/1,000,000) gram. 3  metric grain, grain - a weight unit used for pearls or diamonds: 50 mg or 1/4 carat.