At which stage of the cell cycle, secondary oocyte gets arrested before pregnancy? |
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a) |
Anaphase-I |
b) |
Prophase-II |
c) |
Metaphase-III |
d) |
Telohase-I |
At which stage of the cell cycle, secondary oocyte gets arrested before pregnancy? |
|||||||
a) |
Anaphase-I |
b) |
Prophase-II |
c) |
Metaphase-III |
d) |
Telohase-I |
(d)
Ovary is internally differentiated into four parts, i.e., outer germinal epithelium of cubical cells, a delicate sheath of connective tissue or tunica albuginea, a cortex of dense connective tissue with reticular fibres, spindle-shaped cells, ovarian follicles and a few blood vessels while the central part of medulla is made of less dense connective tissue with elastic fibres, smooth muscles, a number of blood vessels and a few nerves.
Maturation of secondary oocyte is completed in mother’s oviduct after the sperm entry into it for fertilization. oocyte stops advancing further after the completion of metaphase-II. Sperm entry restart the cell cycle by breaking down MPF (Maturation Promoting Factor) and truning on APF (Anaphase Promoting Factor)