Question

Place the following events of oogenesis in the correct order:

1) Production of the first polar body
2) Sperm entry
3) Mitosis of the oogonium
4) Completion of meiosis
5) Primary oocyte stalls in meiosis I
6) Ovulation

Select one:

A. 3, 5, 1, 6, 4, 2

B. 3, 5, 1, 4, 6, 2

C. 5, 1, 4, 6, 2, 3

D. 3, 5, 1, 6, 2, 4

E. 6, 3, 5, 4, 1, 2

Answer 1

Answer= A. 3, 5, 1, 6, 4, 2

Explanation =

events of oogenesis in the correct order: as follows:

1) Mitosis of the oogonium

2) Primary oocyte stalls in meiosis I

3) Production of the first polar body

4) Ovulation

5) Completion of meiosis
6) Sperm entry

Ova or ovum is the female gamete, the process of production of ova from primordial germ cells is called as oogenesis.

there are 6 events takes place from primordial germ cells to ova.

In first stage, the primordial germ cells (oogonia) undergoes mitosis to produce two oogonia.

Second stage, each oocyte starts to undergoes meiosis I, they are arrested in meiosis I.

third stage, primary oocyte produced secondary oocyte & the first polar body.

fourth stage, ovulation occurs once secondary oocyte is formed.

fifth stage, there is completion of meiosis II , of secondary oocyte, produces mature female gamete that is ova.

sixth stage, sperm from male enters into the ova. at this stage fertilization occurs.