A male human cell undergoes meiosis. (a) If nondisjunction of sex chromosomes occurs in meiosis I, the sperm could have an extra or missing X or Y chromosome. (b) If the X chromosome nondisjoins in meiosis II, the sperm could have two X's or no X. (c) If the Y chromosome nondisjoins in meiosis II, the sperm could have two Y's or no Y.

1. (3 pts) Suppose that a cell undergoes meiosis in a phenotypically normal male human. Consider
the possibility that nondisunction of the sex chromosomes takes place. Sketch the chromosome
constitution that would be present in the sperm formed under the conditions below. (a)
Nondisjunction takes place in meiosis I. (b) Nondisjunction occurs for the X chromosome in
meiosis II. (c) Nondisjunction occurs for the Y chromosome in meiosis II.