You searched for: “isochromosome
isochromosome
An abnormal chromosome with two identical arms due to duplication of one arm and loss of the other arm.

Isochromosomes are found in some girls with Turner syndrome (chromosome disorder in females that is characterized by the absence of all or part of a second sex chromosome in some or all cells), patients with the Pallister-Killian syndrome (a condition with multiple malformations at birth and mental retardation), and some tumors.