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:If a person has two alleles of the sickle cell…Individuals with blood group AB can donate blood to…Use arrows to show the route and direction of blood…An individual with blood group AB can receive blood…When both alleles in a heterozygous individual are…