Kathleen and Alphonse Are Expecting Their First Child, and Are

Multiple Choice

Kathleen and Alphonse are expecting their first child, and are having a pleasant conversation about the sex of the baby. Kathleen says, "Well, as long as all of the chromosomes are X, we'll be having a girl!" How can Alphonse best respond?

A) ​"That isn't exactly right, since it is an XY chromosomal pattern that produces a female baby."
B) "Actually, it is only one pair of chromosomes that determines the sex of the baby, but as long as they are both X, you will have a girl."​
C) ​"It is not the chromosomes, but the genes that make up the chromosomes that determine whether we'll have a son or a daughter."
D) ​"We still have six months to go before the sex of the baby will be determined by the 15th and 16th pairs of chromosomes."