ZoologyIdentify the correct path of a spermatozoon during fertilization.

Identify the correct path of a spermatozoon during fertilization.

  1. A

    Theca externa → theca interna → corona radiata → zona pellucida

  2. B

    Corona radiata → zona pellucida → plasma membrane of the oocyte → cytoplasm of the oocyte

  3. C

    Zona pellucida → corona radiata → plasma membrane of the oocyte→ cytoplasm of the oocyte

  4. D

    Corona radiata → oolemma → zona pellucida → cytoplasm of the oocyte

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    Solution:

    At the time of ovulation, the secondary oocyte is surrounded by the zona pellucida and corona radiata. The sperm must first penetrate the corona radiata, then the zona pellucida and then the oolemma (plasma membrane of the oocyte) to enter the cytoplasm of the oocyte.

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