Distinguish between spermatogenesis and oogenesis on three points.

Spermatogenesis begins at puberty and continues throughout life, while oogenesis begins in foetal life and is completed only at fertilisation. Spermatogenesis gives four functional sperms from each primary spermatocyte, while oogenesis gives one ovum and three polar bodies from each primary oocyte. Spermatogenesis occurs in the testes and oogenesis in the ovaries.

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Explanation

The unequal division in oogenesis conserves the cytoplasm for the single ovum.