A) egg is fertilised in the uterus
B) embryo complets it development in a test-tube
C) embryo is transplanted in utreus after some ime
D) egg is fertilised outside mother's body and, transplanted in uterus at 32-celled stage
Correct Answer: D
Solution :
In test-tube babies, egg is fertilised in vitro upto certain celled stage, which is followed by embryo transfer. On the basis of stage of embryo transfer and seta of transfer, in vitro fertilisation embryo transfer is of ZIFT (Zygote Intra Fallopion Transfer) at 8-blastomere stage and IUT (Intra-Uterine Transfer) more than 8-blastomere stage (especially at 32-celled stage).
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