Question

ABO blood groups in humans are controlled by the gene l. It has three alleles-l A, l B and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

• A. Two
• B. Three
• C. One
• D. Four

Answer 1

The correct option is D

Four

ABO blood group system is an example of multiple alleles but we will inherit only two alleles of a genes. So, the answer is four.