Question

In humans, blood type inheritance is an example of
a. predominance.
b. incomplete dominance.
c. codominance.
d. complete dominance.

Answer 1

I would say the answer is: Co-dominance

When I was taking biology I learned that there are 3 types of alleles.

You have IA, IB, and little i. The little i means it is a recessive trait. IA and IB are co-dominant. There's a lot more gibberish language I could use.  

Good luck and hopefully this helped. If you need me to go into greater detail just let me know.