GIFT is an assisted reproductive technique used for intended couples who are unable to have children. What iS done in thiS?

Options

A. embryo implantation after in vitro fertilization
B. egg implantation for in vivo fertilization
C. zygote implantation after in vivo fertilization
D. egg implantation before in vitro fertilization

Answer

### Step-by-Step Solution:

1. **Understanding GIFT**: GIFT stands for Gamete Intrafallopian Transfer. It is an assisted reproductive technology (ART) used for couples who are unable to conceive naturally.

2. **Identifying the Problem**: GIFT is specifically designed for women who cannot produce viable eggs (ova) but have a healthy uterus that can support a pregnancy.

3. **Role of Donor**: In this technique, eggs are obtained from a donor female. This is crucial because the intended mother is unable to produce her own viable eggs.

4. **Procedure**: The collected eggs from the donor are then transferred directly into the fallopian tubes of the intended mother. This allows for natural fertilization to occur within her body.

5. **Fertilization Process**: After the eggs are implanted in the fallopian tubes, fertilization can occur naturally (in vivo fertilization) if sperm is present. This can happen through natural intercourse or artificial insemination.

6. **Conclusion**: The correct description of GIFT is that it involves egg implantation for in vivo fertilization. This distinguishes it from other techniques like ZIFT (Zygote Intrafallopian Transfer) or IVF (In Vitro Fertilization), which involve different processes.

### Answer:
GIFT involves egg implantation for in vivo fertilization, making it suitable for women who cannot produce viable eggs but have a healthy uterus.