SaraNextGen.Com

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



Question ID - 6989 | SaraNextGen Top Answer

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

1 Answer
127 votes
Answer Key / Explanation : (d) -

(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)

127 votes


127