The ABO system consists of A, B, AB, and O blood types. People with type A have antibodies in the blood against type B. People with type B have antibodies in the blood against type A. People with AB have no anti-A or anti-B antibodies.
Developmental dyslexia, or specific reading disability, is a disorder in which children with normal intelligence and sensory abilities show learning deficits for reading.
There is some evidence to suggest genetics play a part in developmental dyslexia (you are born with it). If a child has one dyslexic parent then a boy has a 50% chance of being dyslexic, a girl has a 25% chance. However, it sometimes skips the female children but they become carriers for their children.