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The stage transferred into the uterus after induced fertilization of ova in the laboratory is

1. Zygote
2. Embryo at 4 blastomere stage
3. Embryo at 2 blastomere stage
4. Morula

Correct answer: Morula

Solution

The transferred stage is the morula because it is a multicellular, compact preimplantation stage suitable for uterine transfer after in vitro fertilization. Earlier stages like the zygote or 2- to 4-blastomere embryo are less commonly transferred in this context.

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