MCAT Biology Question 17: Answer and Explanation
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Question: 17
2. Which of the following correctly pairs the stage of development of an egg cell with the relevant point in a woman's life cycle?
- A. From birth to menarche—prophase II
- B. At ovulation—metaphase I
- C. At ovulation—metaphase II
- D. At fertilization—prophase II
Correct Answer: C
Explanation:
From the time of birth until shortly before ovulation, all egg cells are arrested at the prophase stage of meiosis I. These cells are referred to as primary oocytes. At ovulation, the egg cell has completed meiosis I and is now arrested in metaphase II as a haploid cell called a secondary oocyte. When a sperm penetrates the outer layers of the secondary oocyte, it completes meiosis II to become a mature ovum.