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Meiotic division during oogenesis is different from that in spermatogenesis. Explain how and why?

Meiotic division during oogenesis is different from that in spermatogenesis. Explain how and why?

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Meiosis in oogenesis is different  from that of spermatogenesis in being unequal. Unequal division is required to retain the major part of the cytoplasm. Only a minor part is separated as polar body. Only single functional daughter cell called ovum is formed but in spermatogenesis, all the four spermatids are functional. Formation of a single ovum with all essential biochemical ensures proper development of embryo.
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