Which statement best describes nondisjunction in meiosis I versus meiosis II and the resulting gamete compositions?

• A. Meiosis I nondisjunction yields two trisomic and two monosomic gametes; Meiosis II nondisjunction yields two normal and two abnormal gametes.
• B. Meiosis I nondisjunction yields all normal gametes; Meiosis II yields all abnormal.
• C. Meiosis I nondisjunction yields two normal and two abnormal; Meiosis II yields two trisomic and two monosomic.
• D. Nondisjunction only occurs in mitosis.

Answer: (A)