During in vitro fertilisation, the transfer of embryos with more than 8 blastomeres into the uterus is called:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → IUT
In IVF, the zygote is formed in the laboratory and then placed in the female. Where it is placed depends on its stage. A zygote or early embryo with up to 8 blastomeres goes into the fallopian tube (ZIFT). An embryo with more than 8 blastomeres goes into the uterus, and this is called IUT, intra uterine transfer.
Option (1) ZIFT — Incorrect. ZIFT (zygote intra fallopian transfer) places the zygote or an early embryo with up to 8 blastomeres in the fallopian tube, not the uterus.
Option (2) IUT — Correct. IUT (intra uterine transfer) is the transfer of embryos with more than 8 blastomeres into the uterus.
Option (3) GIFT — Incorrect. GIFT (gamete intra fallopian transfer) places an ovum from a donor in the fallopian tube of a female who cannot produce one. No embryo is transferred.
Option (4) IUI — Incorrect. IUI (intra-uterine insemination) introduces semen into the uterus. It is a form of artificial insemination, not an embryo transfer.
NCERT Extract:
Infertility – “… The zygote or early embryos (with upto 8 blastomeres) could then be transferred into the fallopian tube (ZIFT–zygote intra fallopian transfer) and embryos with more than 8 blastomeres, into the uterus (IUT – intra uterine transfer), to complete its further development.”