To form a female zygote, the sperm cell must contribute which chromosome?
Correct answer: A. X
- A. X
- B. 2X
- C. Y
- D. XY
Explanation
To form a female zygote, the sperm cell must contribute a sex chromosome carrying an X chromosome. In humans, the sex chromosomes are labeled as X and Y. Females have two X chromosomes (XX), and males have one X and one Y chromosome (XY).
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Human reproduction covers the male and female reproductive organs, gamete formation, fertilization, implantation and hormonal regulation. The menstrual cycle includes ovarian and uterine changes controlled by pituitary and ovarian hormones, while sexually transmitted diseases are studied through their causes, transmission, symptoms, prevention and effects on fertility.
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