Blood type is controlled by two equally dominant genes. what type of example is this?

Answer

Blood group is an example of Codominance

Explanation

Both of these genes are dominant when A gene express blood group will b A .when B express blood group is B . when both are not express then blood group is O . when both of gene A and B express the blood group is AB. So these genes have because have dominant expression so can not mask the effect of each other.

the correct answer is 2 and 4