Number of Spermatozoa from One Primary Spermatocyte

From one primary spermatocyte, how many spermatozoa are formed?

Correct Answer: 4

One primary spermatocyte undergoes Meiosis I to form 2 secondary spermatocytes, which then undergo Meiosis II to form 4 spermatids, which mature into 4 spermatozoa.

Pathway from Primary Spermatocyte

• 1 Primary spermatocyte (2n) → Meiosis I → 2 Secondary spermatocytes (n)
• 2 Secondary spermatocytes → Meiosis II → 4 Spermatids (n)
• 4 Spermatids → Spermiogenesis → 4 Spermatozoa

Comparison with Oogenesis

• 1 Primary spermatocyte → 4 functional spermatozoa
• 1 Primary oocyte → 1 functional ovum + 3 polar bodies (wasted)
• This contrast highlights the biological difference: males produce millions of sperm; females produce one mature egg per cycle.