JAMB - Biology (2000 - No. 43)
Blood grouping in human beings is derived from combinations of
two different alleles
four different alleles
three different alleles
two different genes
Explication
The four main blood groups A, B, AB, and O are controlled by three alleles: A, B, and O.The four main blood groups A, B, AB, and O are controlled by three alleles: A, B, and O. As humans are diploid, only two of these can be present in any one genotype. In other words, only two of these alleles are present at the same time in a person's cell.