The number of alleles controlling blood groups in humans? by Sunday | Sep 7 | Biology JAMB | 0 comments A. 3 B. 4 C. 5 D. 2 Correct Answer: Option A – 3 Users Also Read These:Individuals with blood group AB can donate blood to…If a person has two alleles of the sickle cell…What is the probability? of a man of blood group AB…A man with blood group A (TAP) married a woman with…A person with blood group B can only donate blood to…