Biology · Reproductive Health · NEET
No. IVF is only the step where the egg and sperm are joined outside the body to make a zygote. ZIFT and IUT are transfer steps that come after — they move the zygote or embryo back into the woman's body. So IVF makes it, ZIFT/IUT deliver it. In the test tube baby programme, IVF is followed by embryo transfer (ET), and ZIFT and IUT are two forms of that transfer.
In ZIFT the zygote or early embryo (up to 8 blastomeres) is placed into the fallopian tube. In IUT the embryo with more than 8 blastomeres is placed into the uterus. This matches natural biology: a young embryo normally travels down the tube, and an older embryo normally reaches the uterus to implant.
The cut-off is 8 blastomeres. Up to 8 blastomeres → fallopian tube (ZIFT). More than 8 blastomeres → uterus (IUT). NEET often tests this exact number, for example an embryo with more than 16 blastomeres is transferred into the uterus because 16 is more than 8.
ZIFT can carry either — the name says zygote, but NCERT states the zygote OR early embryos (up to 8 blastomeres) can be transferred in ZIFT. So both a single-cell zygote and an early multi-cell embryo (up to 8 cells) qualify for the fallopian tube route.
Yes. NCERT clearly says embryos formed by in-vivo fertilisation (fusion of gametes inside the female) can also be used for such transfer, to help females who cannot conceive. So the transferred embryo does not have to come from IVF.
ZIFT transfers a zygote or early embryo (already fertilised) into the fallopian tube. GIFT transfers an ovum (an unfertilised gamete) from a donor into the fallopian tube of a woman who cannot make her own egg. In short: ZIFT = fertilised (embryo), GIFT = unfertilised (gamete).
Embryo with more than 16 blastomeres formed due to in-vitro fertilization is transferred into
In which of the following techniques, the embryo are transferred to assist those females who cannot conceive?
Try the real previous-year questions from this chapter — each with the answer and a full solution.
ZIFT stands for Zygote Intra Fallopian Transfer and IUT stands for Intra Uterine Transfer. Both are embryo transfer methods used in assisted reproductive technology (ART).
ZIFT places the zygote or early embryo (up to 8 blastomeres) into the fallopian tube. IUT places an embryo with more than 8 blastomeres into the uterus. The dividing line is 8 blastomeres.
Yes. In the test tube baby programme, IVF is followed by embryo transfer, and ZIFT and IUT are two forms of that transfer that place the zygote or embryo back into the body.
IUT is used. An embryo with more than 8 blastomeres is transferred into the uterus, while up to 8 blastomeres are transferred into the fallopian tube by ZIFT.
Yes. NCERT states that embryos formed by in-vivo fertilisation (fusion of gametes inside the female) can also be used for ZIFT or IUT to help women who cannot conceive.
