Briefly explain the IVF and ET. What are the conditions in which these methods are advised?

Explanation

IVF and ET stands for in vitro fertilization and embryo transfer. The egg of a wife/donor is removed and fertilized (in vitro) by the husband/donor sperm in the laboratory under sterile conditions. The fertilized egg (zygote) when reaches upto 8 celled (blastomeres) stage, it is transferred into the fallopian tube of the host or surrogate mother (ZI FT-zygote intra fallopian transfer) and the embryos with more than 8 blastomeres into the uterus (IUT-intra uterine transfer) to complete its further development.