Many things are determined by genetics. Genetics has a big toll on a person's makeup. Just like eye or hair color, our blood type is inherited from our parents. These articles gave a straight forward answer to our main question, "Is blood type determined by genetics?". Yes! Genetics has complete control over what blood type your offspring will have. Each biological parent donates one of the two ABO genes to the child. When that happens, the O is recessive and A or B are dominant. This all would be decided from the parents of the offspring.