GK
HUMAN BODY AND REPRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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ovum
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oogonia
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primary oocyte
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secondary oocyte
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Detailed explanation-1: -Secondary oocytes start undergoing second meiotic division but get arrested at metaphase II; until they meet the sperm in the fallopian tube. The secondary oocyte completes meiosis at the time of fertilization. After completing meiosis, the secondary oocyte gives rise to an ovum.
Detailed explanation-2: -The secondary oocyte completes its second meiotic division after a sperm has penetrated the secondary oocyte and sterilization has occurred. Therefore, the correct answer is A. When the secondary oocyte unites with sperm and becomes a zygote.
Detailed explanation-3: -The secondary oocyte is produced by meiosis I in the primary oocyte. The meiotic division of the secondary oocyte is arrested at the Metaphase II phase of meiosis II. The division is completed after fertilization of the ovum by the sperm.