EMBRYOLOGY
FEMALE SEX GLAND OVARIES ÖOGENESIS AND MENSTRUAL CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Stage 1
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Stage 2
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Fertilisation
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Ovulation
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Detailed explanation-1: -Fertilization and completion of meiosis. (A) Fertilization induces the transition from metaphase II to anaphase II, leading to completion of oocyte meiosis and emission of a second polar body (which usually degenerates).
Detailed explanation-2: -After meiosis, egg cells end up with half the number of chromosomes, and after meiosis, the sperm cells also end up with a matching other half. Then the full number is restored once the sperm cell and the egg cell join up (fertilization).
Detailed explanation-3: -During meiosis II, the duplicated chromosomes are separated into a polar body and a mature ovum. At this point, the haploid nuclei of the egg and sperm are able to fuse to form the zygote. Therefore, when meiosis II is completed is given by answer choice (A): after a secondary oocyte has been fertilized.