A) Embryo only, upto 8 cell stage
B) Either zygote or early embryo upto 8 cell stage
C) Embryo of 32 cell stage
D) Zygote only
Correct Answer: B
Solution :
In vitro fertilization (IVF) or test-tube baby technique involves fertilizing one or more eggs outside the body and then transferring the fertilized eggs known as pre-embryos back into the uterus. Zygote Intra Fallopian Transfer (ZIFT) is an example of IVF. In this, the zygote or early embryos upto 8 blastomeres are transferred into the Fallopian tube. If the embryo has more than 8 blastomeres then it is transferred into uterus called as IUT.
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