In which phase do the primary oocytes get arrested during early foetal development-Prophase of Meiosis II-Metaphase of Meiosis I-Metaphase of Meiosis II-Prophase of Meiosis I-

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Process of Oogenesis

In which phas...

Question

In which phase do the primary oocytes get arrested during early foetal development?

Metaphase of Meiosis I

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Metaphase of Meiosis II

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Prophase of Meiosis I

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Prophase of Meiosis II

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Solution

The correct option is C
Prophase of Meiosis I

Oogenesis is initiated during the embryonic development stage when a couple of million gamete mother cells (oogonia) are formed within each foetal ovary; no more oogonia are formed and added after birth. These cells start division and enter into prophase-I of the meiotic division and get temporarily arrested at that stage, and are called primary oocytes. They remain arrested at this phase until puberty, after which monthly changes happen.

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At the metaphase plate during metaphase II of meiosis, there are

Oogonia go through____(i)____ during the first three months of fetal development, producing all the primary oocytes. Primary oocytes begin the process of meiosis but are halted in___(ii)____. Meiosis resumes, one oocyte at a time, beginning with the first ___(iii)______. This process is stimulated by ____(iv)_______. The secondary oocyte is arrested in ____(v)_____.

Q. If the number of bivalents are 8 in metaphase I, what shall be the number of chromosomes in daughter cells after meiosis I and meiosis II respectively.

Question 2

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(d) Anaphase-I

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