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In vitro fertilisation is a technique that involves transfer of which one of the following into the fallopian tube?

1. Embryo only, upto 8 cell stage
2. Either zygote or early embryo upto 8 cell stage
3. Embryo of 32 cell stage
4. Zygote only

Correct answer: Either zygote or early embryo upto 8 cell stage

Solution

In IVF-related tubal transfer, the material placed into the fallopian tube must be at a very early developmental stage so it can continue development and reach the uterus naturally. That is why either a zygote or an early embryo up to the 8-cell stage is transferred.

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