Experiments That First Identified a Role for the MHC Gene

Experiments that first identified a role for the MHC gene locus in tissue identification were successful in mice because:

A) mice can yield large litters,and great numbers of offspring were needed for genetic analyses.
B) mice have very small genomes,making it easier to link genetic changes to functional changes.
C) mice with identical genetic backgrounds were able to accept tissue transplants,but other strains of mice rejected the tissue.
D) mice without intact immune systems are routinely used to study the effects of MHC molecules.