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.
