How many spermatozoa are formed from one secondary spermatocyte ?

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A primary spermatocytes completes the first meiotic division (reduction division) leading to formation of two equal haploid cells called secondary spermatocytes (each has $\mathrm{n}=23$ chromosomes). The secondary spermatocytes undergo the second meiotic division to produce four equal haploid spermatids.

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  • [AIIMS 2016]

What is oogenesis? Give a brief account of oogenesis.

$A$ - Acrosome possesses mitochondria.

$R$ -Middle piece of sperm is filled with enzymes