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Why are polar bodies formed during oogen...

Why are polar bodies formed during oogenesis but not during spermatogenesis?

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During oogenesis, the primary oocyte undergoes unequal cytokinesis during meiosis-I and meiosis-II to retain most of cytoplasm in one ovum so 2 or 3 Polar bodies are formed. But during spermatogenesis, the primary spermatocyte undergoes equal cytokinesis so no polar bodies are formed.
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