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."

Question

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."

Quizplus · Accepted Answer

B is correct because the sex of a baby is determined by one pair of sex chromosomes, where XX results in a female and XY results in a male.

Kathleen and Alphonse Are Expecting Their First Child, and Are