One of the following is a haploid cell:
Correct answer: D. Secondary oocyte
- A. Primordial germ cell
- B. Oogonium
- C. Primary oocyte
- D. Secondary oocyte
Explanation
After the first meiotic division of the primary oocyte, it forms a secondary oocyte and a polar body. The secondary oocyte is a haploid cell because it contains only one set of chromosomes (23 chromosomes in humans). It is released from the ovary during ovulation and, if fertilized by a sperm, will complete meiosis to become an ovum.
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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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