Question

$1^{st}$ polar body is formed at which stage of oogenesis?

• A. $1^{st}$ meiosis
• B. $2^{nd}$mitosis
• C. $1^{st}$ mitosis
• D. Differentiation

Answer 1

The Correct Option is A

During maturation phase of oogenesis, primary oocyte undergoes first meiotic division and form two haploid daughter cells; large secondary oocyte and small first polar body.

Answer 2

Explanation:

• The process of formation of ovum (female gamete) is called oogenesis.
• This process occurs in the ovaries of the female reproductive system.
• During oogenesis, a diploid oogonium or egg mother cell increases in size and converts into a diploid primary oocyte.
• The diploid primary oocyte undergoes the first meiotic division i.e. meiosis I to form 2 unequal haploid cells.
• The smaller cell is called the first polar body, while the larger one is called the secondary oocyte. (maturation phase)
• A second polar body and an ovum are produced when the secondary oocyte undergoes a second meiotic division i.e., meiosis II.
• Thus, throughout the process of oogenesis, multiple polar bodies and a single haploid ovum are produced by a diploid oogonium.

Therefore, the correct option is (A): 1st meiosis.