The fertilization of an egg in a medium and subsequent transfer to mother's uterus is known as:

Correct option is B

Sol. In vitro fertilization (IVF) involves fertilizing an egg outside the body and then transferring it to the mother's uterus.
Explanation of each option:
· (a) Zygote intrafallopian transfer – This involves transferring a zygote (fertilized egg) into the fallopian tube, not directly into the uterus.
· (b) In vitro fertilization – Correct answer. IVF is the process where the egg is fertilized outside the body and then transferred to the uterus.
· (c) Intra cytoplasmic injection – This involves injecting a single sperm into an egg, which is part of IVF but does not include the transfer to the uterus.
· (d) Gamete intrafallopian transfer – This involves transferring both the egg and sperm into the fallopian tube, not the uterus.