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Question
ln oogenesis, haploid egg is fertilized by sperm at which stage?
ln oogenesis, haploid egg is fertilized by sperm at which stage?
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Solution
The correct option is B Secondary oocyte
The oocytes undergo meiosis in response to hormonal stimulation. Cell division the following meiosis I and produces a small polar body and a large secondary oocyte. The secondary oocyte then proceeds to enter meiosis II and remain arrested at metaphase II where they remain until fertilization. Not only does fertilization lead to the mixing of paternal and maternal chromosomes but it also induces a number of changes in the egg cytoplasm that are critical for further development. These alterations activate the egg, leading to the completion of secondary oocyte meiosis and initiation of the mitotic cell cycles of the early embryo. Thus, the correct answer is option B.
The oocytes undergo meiosis in response to hormonal stimulation. Cell division the following meiosis I and produces a small polar body and a large secondary oocyte. The secondary oocyte then proceeds to enter meiosis II and remain arrested at metaphase II where they remain until fertilization. Not only does fertilization lead to the mixing of paternal and maternal chromosomes but it also induces a number of changes in the egg cytoplasm that are critical for further development. These alterations activate the egg, leading to the completion of secondary oocyte meiosis and initiation of the mitotic cell cycles of the early embryo. Thus, the correct answer is option B.
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