Conversion Rule. If you convert money from a tax-deferred retirement account to a Roth IRA, you must wait at least five years before taking distributions of the converted amounts to avoid the 10 percent early withdrawal penalty. However, you won't pay income taxes on the distribution, because you paid them on the conversion.
Freebase(0.00 / 0 votes)Rate this definition: Polysomy. Polysomy is a condition in which an otherwise diploid organism has at least one more chromosome than normal, i.e. the number of a particular chromosome is not diploid - there may be three or more copies of the chromosome rather than the expected two copies.
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 humansâall other cases of full monosomy are lethal and the individual will not survive development.