Question

1st polar body is formed at which stage of oogenesis?
A)Meiosis I
B)Mitosis I
C)Differentiation
D)None of these

Answer 1

The process of oogenesis takes place in the ovaries which is the primary female reproductive organ. This is the process by which the female gamete or the ovum is formed.

Complete answer:
The process of oogenesis consists of a maturation phase. In this the cell known as the primary oocyte undergoes meiotic or reduction division, to form two haploid daughter cells. The larger cell is known as the secondary oocyte, while the smaller cell formed is known as the polar body. The formed polar body does not possess any specific function and dies soon after the formation. Thus the first polar body is formed during Meiosis I.

Considering the other given options:
Considering option B: Mitosis I occurs in the cell known as the oogonium, which is the initial cell present. The process of mitosis forms a diploid primary oocyte, on which meiosis I occur. Thus it is not the right option
Considering option C: Differentiation is the whole process of oogenesis, which is the process of differentiation of the ovum. Thus C is not the right option.
Considering option D, None of the above is the appropriate option since there is a right option among the ones given above.

Hence, the correct answer is option (A)

Note: The process of oogenesis occurs even before the baby is born. Several oocytes are already present during the birth of the baby. After which the process goes into arrest in the first prophase stage till the person attains puberty.