Question

In an oocyte, Meiosis II completes upon.

a.Implantation into the uterus

b.Fertilization (entry of the sperm into the egg)

c.Cell division of the fertilized egg

d.Ovulation

e.Onset of Puberty

Answer 1

Here, the correct option is b) fertilisation (entry of the sperm into the egg)

Explanation -

The female ova is formed by the meiosis division, process known as oogenesis. From oogonium, diploid primary oocyte is formed by mitosis division.

The primary oocyte start to undergo meiosis 1 but it arrest in the prophase 1of meosis 1, this takes place before birth.

After puberty, the meiosis 1 continues and secondary oocyte is formed. Secondary oocyte is haploid but meiosis is not completed. It agains arrest at the Metaphase 2 of meiosis 2.

After fertilisation by sperm, when sperm penetration takes place the the meosis is completed to form mature ovum.