Rh-D-negative individuals generate an immune response when they are exposed to the Rh-D antigen. However incompatibility in the ABO blood group system occurs naturally in the absence of exposure to the A or B antigen in the blood from another individual. why do individuals produce an immune response the first time they encounter the A or B antigen as an adult.​

In cattle a single gene with two alleles determines fur color the fur can be red white or roan roan fur has both red and white hair which of the following statements is true a the allele for roan fur color is dominant over red and white fur color b the allele for red fur color is dominant over white and roan fur color c the roan and white alleles are expressed independently of the other d the red and white alleles are expressed independently of each other