Extrusion of the second polar body from the e | vedclass

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Question

(A) The secondary oocyte remains arrested at the metaphase-$II$ stage of meiosis-$II$ until a sperm makes contact with the zona pellucida of the ovum.

Vedclass · Accepted Answer

after entry of sperm but before fertilization

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(A) The secondary oocyte remains arrested at the metaphase-$II$ stage of meiosis-$II$ until a sperm makes contact with the zona pellucida of the ovum.Upon the entry of the sperm into the cytoplasm of the secondary oocyte,the completion of meiosis-$II$ is triggered.This process results in the formation of a large haploid ovum (ootid) and a small second polar body.Therefore,the extrusion of the second polar body occurs after the entry of the sperm but before the fusion of the male and female pronuclei (fertilization).

Extrusion of the second polar body from the egg nucleus occurs:

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