NEET 2010 Biology question

The second maturation division of the mammalian ovum occurs

(1)Until after the ovum has been penetrated by a spermCorrect
(2)Until the nucleus of the sperm has fused with that of the ovum
(3)In the Graafian follicle after the first maturation division
(4)Shortly after ovulation before the ovum makes entry into the fallopian tube

Answer: (1)

Solution

The primary oocyte completes meiosis I just before ovulation to form a secondary oocyte and first polar body. The secondary oocyte is arrested at metaphase II at ovulation and meiosis II is completed only when a sperm penetrates the ovum (the entry of the sperm induces the completion of

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Question ID VK-090591