Question

In spermatogenesis, a primary spermatocyte produce four similar sperms while in oogenesis a primary oocyte forms

• A. Four similar ova
• B. Three layer ova and one polar body
• C. Two large ova and two polar bodies
• D. One large ovum and $2-3$ polar bodies

Answer 1

The correct option is D One large ovum and $2-3$ polar bodies

Spermatogenesis is the process of formation of spermatid(n) from spermatogonia$\left(2n\right)$. The process goes as follows:-

Spermatogonia$\left(2n\right)⟶$ Primary Spermatocyte$\left(2n\right)⟶$Secondary Spermatocyte$\left(n\right)⟶4$ Spermatid(n)

Oogenesis is the production of an ovum from oogonia. The mechanism, in short, can be depicted as below:-

Oogonia$\left(2n\right)⟶$ Primary Oocyte$\left(2n\right)⟶$ Secondary Oocyte$\left(n\right)+$ 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 duplicates itself to form two polar body during meiosis II. However, the secondary oocyte completes its meiosis during fertilization to form an egg(n) and the second polar body(n). So the correct answer is D.