In a family of four children, one has type o blood, one has type ab blood, one has type b blood, and one has type a blood. what are the possible genotypes of the parents?

AO, BO. cause thats makes it where the childern can have all blood types 

I’m not exactly sure what your trying to ask, but if it’s how an organelle is similar to a body system or a part a nucleus is like a in function. but i don’t fully understand what you’re trying to ask