If a mother is donating her kidney to son, this is an example of which of the following?

Donor and recipient are of same species and different individual : Allograft Donor and recipient are of same individual : Autograft Graft between different individual but of similar genetic makeup as in identical twins : Isograft Graft between different species : Xenograft For any organ transplantation, the single most impoant gene which has to be match is HLA DR for successful transplantation.