Choose the statement that correctly describes the effect of nondisjunction on chromosome number in gametes.

A. Nondisjunction in meiosis II leads to two gametes with a missing chromosome and two gametes with an extra chromosome because both cells produced in meiosis I are affected.
B. Nondisjunction in meiosis II leads to one gamete with a missing chromosome and one gamete with an extra chromosome, whereas the other two gametes are haploid because the two cells produced in meiosis I divide independently.
C. Nondisjunction in meiosis I leads to four gametes missing a chromosome because the two cells created in the first division continue to have a missing chromosome after the second division.
D. Nondisjunction in meiosis I leads to four gametes with an extra chromosome because the two cells created in the first division continue to have an extra chromosome after the second division.