Question

50 secondary oocytes in female and 50 secondary spermatocytes in male give rise to

• A. 50 ova and 100 sperms
• B. 100 ova and 200 sperms
• C. 200 ova and 50 sperms
• D. 100 ova and 100 sperms

Answer 1

The correct option is A 50 ova and 100 sperms

Spermatogenesis is the process of formation of spermatid (n) from spermatogonia(2n).
The process is as follows: -
Spermatogonia(2n) ⟶ Primary Spermatocyte(2n) ⟶2 Secondary Spermatocyte(n)⟶4 Spermatid(n) Oogenesis is the production of an ovum from oogonia.

The mechanism, is depicted as below: - Oogonia(2n) ⟶ Primary Oocyte(2n) ⟶ Secondary Oocyte(n)+ Polar Body(n) This meiosis I is an unequal division leading to the formation of a haploid ovum and a polar body. The first polar body is said to be atretic and does not divide further. However, the secondary oocyte completes its meiosis during fertilization to form an egg(n) and the second polar body(n).

So, 50 secondary oocytes produce 50 ovum and 50 secondary spermatocytes produce 100 sperms.