Which statement describes the process that determines the sex of an offspring?
A. The eggs, or ova, contain the X chromosome, and the sperm cells carry either the X or the Y. The sperm cell that is involved in fertilization determines the sex of the offspring.
B. The sperm cells all carry the X chromosome. The ovum contains both the X and Y, so it is the ovum that determines the sex of the offspring.
C. The ovum and sperm cells both carry X chromosomes. The placenta carries both the X and Y, and it determines the sex of the offspring.
D. The ovum and the sperm cells both contain the X chromosome. During the course of fertilization, either an X or a Y will be created, which determines the sex of the offspring.
Answer: A
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