Expand and explain the following techniques used in the 'Test Tube Baby' programme : (a) GIFT (b) ZIFT (c) IUI

The correct answer is:
(a) GIFT: Gamete Intra Fallopian Transfer, transfer of an ovum collected from a donor into the fallopian tube of another female who cannot produce an ovum but can provide suitable environment for fertilization and further development / It has no role in the process of test tube baby program.
(b) ZIFT: Zygote Intra Fallopian Transfer, zygote or early embryo up to 8 blastomeres transferred into fallopian tube.
(c) IUI: Intra Uterine Insemination, semen collected either from husband or a healthy donor is artificially introduced either into vagina or uterus of the female / It has no role in test tube baby program.

Detailed Step-by-Step Explanation:

1. Gamete Intra Fallopian Transfer (GIFT):
GIFT stands for Gamete Intra Fallopian Transfer. In this technique, an ovum (egg) is harvested from a donor female. Since the recipient female is unable to produce her own functional ova but possesses a healthy uterus and fallopian tubes that can support fertilization and embryonic development, the harvested ovum along with sperm is transferred directly into her fallopian tube. Because fertilization takes place naturally inside the female's body (in vivo), it does not involve in vitro fertilization (IVF) and thus has no direct role in the conventional "test tube baby" program (which relies on laboratory fertilization).

2. Zygote Intra Fallopian Transfer (ZIFT):
ZIFT stands for Zygote Intra Fallopian Transfer. Unlike GIFT, this procedure is a part of the in vitro fertilization (IVF) or "test tube baby" program. Here, fertilization of the egg and sperm is carried out outside the body in a laboratory setting. Once the zygote is formed, or when the fertilized egg divides into an early embryo up to 8 blastomeres, it is surgically transferred into the fallopian tube of the mother or a surrogate. From there, the embryo travels naturally to the uterus for implantation.

3. Intra Uterine Insemination (IUI):
IUI stands for Intra Uterine Insemination. This is an assisted reproductive technology (ART) technique used to treat infertility, especially when there is a low sperm count or poor sperm motility in the male partner. Semen is collected from either the husband or a healthy donor, processed in a lab to concentrate the active sperm, and then artificially introduced directly into the female's vagina or uterus. Since fertilization happens entirely inside the female reproductive tract (in vivo) without fertilizing eggs in a lab dish, it does not form a part of the standard test tube baby (IVF) program.