NEET 2007 Biology question

In cloning of cattle a fertilized egg is taken out of the mother's womb and:

(1)from this upto eight identical twins can be produced
(2)the egg is divided into 4 pairs of cells which are implanted into the womb of others cows
(3)in the eight cell stage, cells are separated and cultured until small embryos are formed which are implanted into the womb other cows.Correct
(4)in the eight cell stage the individual cells are separated under electrical field for further development in culture media.

Answer: (3)

Solution

In embryo-splitting cloning of cattle, a fertilised egg is removed from the mother's womb, allowed to divide in vitro to the 8-cell stage; the blastomeres (still totipotent) are separated and cultured until each forms a small embryo, and these embryos are then implanted into the wombs of surrogate

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Question ID VK-089821