[Answer] Nondisjunction during meiosis results in an abnormal number of chromosomes in one or more gametes. In some cases of nondisjunction a single chromosome fails to separate. In others none of the chromosomes separate. Suppose an egg is produced in which none of the chromosomes separate during meiosis II. What is the chromosome number of the zygote that results if this egg is fertilized by a normal sperm? A. 1n B. 2n C. 2n + 1 D. 3n