Ovum,Sperm,fertilization

While Ovum is in the Ovary it is in Primary Oocyte stage.

Just before ovulation meiosis takes place and Secondary Oocyte is formed and first Polar body expelled.

The secondary Oocyte Immediately begins second Meiotic division but is arrested in metaphase.
This division is completed only when the sperm penetrates the ovum and the second polar body is expelled

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