Question

ABO blood group in man is controlled by

• A. Multiple alleles
• B. Multiple cells
• C. Sex- linked genes
• D. V- linked genes

Answer 1

The correct option is A Multiple alleles

A number of human traits are the result of more than two types of alleles. Such traits are said to have multiple alleles for that trait.
Blood type is an example of a common multiple allele trait. There are 3 different alleles for the blood type (A, B and O). A is dominant to O. B is dominant to O. A and B both are codominant.
Therefore, the correct answer is option A.