The second maturation division of the mammali | vedclass

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Question

(b) : Oogenesis starts with division of oogonia (gamete mother cells) giving rise to primary oocyte which enters into prophase $I$ of the meiotic divi

Vedclass · Accepted Answer

until after the ovum has been penetrated by a sperm

Vedclass · Answer

(b) : Oogenesis starts with division of oogonia (gamete mother cells) giving rise to primary oocyte which enters into prophase $I$ of the meiotic divison and get temporarily arrested at this stage. These primary oocyte gets surrounded by primary, secondary and tertiary follicles respectively. The tertiary follicle grow in size and completes its first meiotic divison to give rise to haploid secondary oocyte. This secondary oocyte forms a new membrane called zona pellucida surrounding it. During fertilisation the sperm enter into the cytoplasm of the ovum through the zona pellucida and the plasma membrane. This induces the completion of the meiotic division ($2^{nd}$ divison) of the secondary oocyte. The second meiotic division is also unequal and results in the formation of a second polar body and a haploid ovum (ootid).

The second maturation division of the mammalian ovum occurs

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$A$ : In spermatogenesis, the first haploid forms are spermatids.
$R$ : All the end of meiosis cells have haploid set of chromosomes.