What is "monosomy"

n. A genetic disorder with the presence of only one chromosome (instead of the typical two in humans) from a pair.

n. chromosomal abnormality consisting of the absence of one chromosome from the normal diploid number

Monosomy is a form of aneuploidy with the presence of only one chromosome from a pair. Partial monosomy occurs when only a portion of the chromosome has one copy, while the rest has two copies.