Aneuploidy is most often caused by ________, the failure of chromosomes to separate during meiosis.

Nondisjunction during meiosis is the most common cause of the aneuploidies, which can also occasionally result from a chromosomal rearrangement (e.g., Robertsonian translocation or a balanced sex chromosome translocation) [26].

From: Human Reproductive and Prenatal Genetics, 2019