Question

What effect does fertilisation have on a secondary oocyte?

Answer 1

Fertilisation:

1. The fusion of gametes is known as fertilization.
2. During fertilisation, sperm and egg combine to produce a diploid zygote, which begins prenatal development.

Oogenesis:

1. Oogenesis is a kind of gametogenesis in which ova, also known as female gametes, are generated, and the produced female gamete is referred to as an ovum.
2. Before birth, the stages of oogenesis that lead to the development of primary oocytes take place.
3. Primary oocytes do not continue to split.
4. They either deteriorate or form secondary oocytes.

Effect of fertilisation on a secondary oocyte:

1. During a woman's ovarian cycle, one oocyte is chosen to complete meiosis I, forming a secondary oocyte and a first polar body.
2. When meiosis I is complete, the resultant oocyte is a secondary oocyte, which gives birth to a mature oocyte and a second polar body at completion of meiosis II.
3. Following ovulation, secondary oocytes are blocked at metaphase II of meiosis II until fertilisation occurs.
4. When a sperm cell fertilises a female sex cell, the secondary oocyte quickly completes the remaining phases of meiosis II, producing a mature oocyte and a second polar body.