Read the following statements regarding the extrusion of the second polar body during human oogenesis: (A) It occurs in the ampullary region of the fallopian tube. (B) It is triggered by the fusion of male and female pronuclei. (C) It marks the completion of an unequal meiotic division. (D) The resulting ootid and the second polar body are both diploid. How many of the above statements are correct?

Step-by-step solution

Statement (A) is correct: The secondary oocyte reaches the ampullary region of the fallopian tube where sperm entry occurs, triggering the extrusion of the second polar body. Statement (B) is incorrect: The completion of meiosis II and extrusion of the second polar body is triggered by the entry of the sperm into the secondary oocyte, which happens strictly before the fusion of male and female pronuclei (syngamy). Statement (C) is correct: The second meiotic division in oogenesis is unequal, resulting in a large oo