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In females a oogonia forms a single ovum...

In females a oogonia forms a single ovum only. What is the significance of the oogonia undergoing meiosis I & II when in a male, each spematogonia forms 4 sperms.

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The meiotic divisions I & II take place in order to ensure that the ovum is haploid since normal chromosomal number is important for formation of normal zygote. Further polar bodies have less cellular contents and are small since they do not participate in fertilization most of the cellular contents lie in the ovum.
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