Chromosomal abnormalities in embryos and why they occur. 🌟 **Primary Causes:** These abnormalities often arise from errors during cell division, such as nondisjunction, where chromosomes fail to separate properly. Environmental factors, advanced parental age, and certain genetic predispositions can also play a role. 🧬 The main causes of these chromosomal abnormalities are: Errors during meiosis in the egg: As women age, the likelihood of errors in chromosome separation during egg maturation in