Isodisomy is a form of uniparental disomy in which both copies of a chromosome, or parts of it, are inherited from the same parent.
It differs from heterodisomy in that instead of a complete pair of homologous chromosomes, the fertilized ovum contains two identical copies of a single parental chromosome.
[3] Some authors use the term uniparental disomy and isodisomy interchangeably.
[4] This genetic abnormality can result in the birth of a normal child who has no obvious disability.
[2] Isodisomy may be a common phenomenon in human cells, and "might play a role in the pathogenesis of various nonmalignant disorders and might explain local impaired function and/or clinical variability.