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Q.
For formation of $200$ sperms, how many $2^{\circ}$ spermatocytes are required?
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Solution:
Each primary spermatocyte undergoes two successive divisions, called maturation divisions. The first maturation division- is reductional or meiotic. Hence, the primary spermatocyte divides into two haploid daughter cells called secondary spermatocytes. Both secondary $(2^{\circ})$ spermatocytes now undergo second maturation division which is an ordinary mitotic division to form four haploid spermatids, by each primary spermatocyte. Thus for producing $200$ sperm, $100$ secondary spermatocytes are required as each $2^\circ$ spermatocyte forms $2$ sperms.