Trisomy

**Definition:** The possession of a third chromosome of any one type in an otherwise diploid cell.

**Tree numbers:** - C23.550.210.050.750 - C23.550.210.182.500 - G05.365.590.175.050.750 - G05.365.590.175.183.500 - G05.700.131.750

**Synonyms:** - Chromosomal Triplication