A woman asks why the fertilised ovum has a diploid chromosome number. Which explanation is correct?
Correct answer: B. The sperm and oocyte nuclei fuse during fertilisation
- A. The ovum duplicates its chromosomes before ovulation
- B. The sperm and oocyte nuclei fuse during fertilisation
- C. The uterus adds chromosomes during implantation
- D. The corpus luteum supplies chromosomes to the zygote
Explanation
Fertilisation combines the haploid chromosomes of the sperm and secondary oocyte, restoring the diploid chromosome number in the zygote. Implantation and corpus luteum activity do not add genetic material.
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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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