Question

If two primary spermatocytes and two primary oocytes undergo meiosis simultaneously, what will be the ratio of spermatozoa and ova produced at the end of gametogenesis?

• A. 2:1
• B. 4:1
• C. 6:2
• D. 1:2

Hint:

The difference in gamete production reflects the reproductive strategies of males and females.

Answer 1

The Correct Option is B

If two primary spermatocytes and two primary oocytes undergo meiosis, the spermatozoa:ova ratio will be 8:2 (simplified as 4:1).

(A) 2:1 - Incorrect: Underestimates sperm production (each spermatocyte yields 4 sperm).

(B) 4:1 - Correct: 2 spermatocytes → 8 sperm; 2 oocytes → 2 ova (plus polar bodies).

(C) 6:2 - Incorrect: Mathematically incorrect for the given inputs.

(D) 1:2 - Incorrect: Reverses the expected ratio.

The correct answer is (B) 4:1, reflecting spermatogenesis (4 sperm per spermatocyte) vs. oogenesis (1 ovum per oocyte).

Answer 2

Spermatogenesis involves the division of a primary spermatocyte into four sperm cells. Oogenesis involves the division of a primary oocyte into only one functional ovum and three non-functional polar bodies.

Therefore, from two primary spermatocytes and two primary oocytes, we get 4 sperm cells and 1 ovum.

Option (B) is correct because the ratio of spermatozoa to ova is 4:1.