Skin grafts between identical twins are more successful than grafts between more unrelated individuals. Why?
A) Identical twins share the same uterine environment.
B) Twins are exactly matched in age.
C) Identical twins have identical HLA alleles.
D) Identical twins are the same sex.
E) None of these is true.

Question

Quizplus · Accepted Answer

HLA (human leukocyte antigen) system is a group of genes that regulate the human immune system. Identical twins have the same HLA alleles, which means their immune systems are less likely to reject transplanted tissues or organs from each other. This is not true for non-twin individuals, even if they are closely related.

Skin Grafts Between Identical Twins Are More Successful Than Grafts