Uniparental Disomy

**Definition:** The presence in a cell of two paired chromosomes from the same parent, with no chromosome of that pair from the other parent. This chromosome composition stems from non-disjunction (NONDISJUNCTION, GENETIC) events during MEIOSIS. The disomy may be composed of both homologous chromosomes from one parent (heterodisomy) or a duplicate of one chromosome (isodisomy).

**Tree numbers:** - C23.550.210.645.890 - G05.365.590.175.935

**Synonyms:** - Disomy, Uniparental