monosomy definition biology
From Wikipedia, the free encyclopedia. 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. Turner syndrome â Women with Turner syndrome typically have one X chromosome instead of the usual two sex chromosomes. 2  Turner syndrome is the only full monosomy that is seen in humansâall other cases of full monosomy are lethal and the individual will not survive development.