In In Vitro Fertilization (IVF):
- The fertilized egg (zygote) is allowed to divide and form an embryo outside the body.
- When the embryo reaches the stage of more than 16 blastomeres (usually at the blastocyst stage), it is ready to be implanted.
- Such a developed embryo is transferred into the uterus, where implantation occurs.
Other options:
- Fallopian tube – used for transferring a zygote with fewer than 8 blastomeres (ZIFT method).
- Fimbriae – finger-like projections at the end of the fallopian tube, not used for embryo transfer.
- Cervix – lower part of uterus, not a site for embryo implantation.
Hence, the correct site for transferring an embryo with more than 16 blastomeres is: uterus.