Which genetic contribution determines whether a normal human zygote is chromosomally XX or XY?
Correct answer: B. The chromosome carried by the sperm
- A. The chromosome carried by the ovum
- B. The chromosome carried by the sperm
- C. The number of polar bodies formed
- D. The thickness of the zona pellucida
Explanation
The ovum normally contributes an X chromosome, whereas the sperm contributes either an X or a Y chromosome. An X-bearing sperm forms an XX zygote, and a Y-bearing sperm forms an XY zygote.
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About Reproductive Anatomy and Conception
Female and male reproductive organs, pelvic anatomy, gametogenesis, the menstrual cycle and the hormonal control of ovulation lead into fertilisation, implantation and early embryonic development. Questions distinguish ovulation from menstruation, fertilisation from implantation, and the normal anatomical changes that allow conception and pregnancy to occur.
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