How many blood types are there how blood type is inherited?
To the second question the answer, in short, is YES;
To answer the first question, there are four logical blood
types: A, B, AB, and O. Then there is the Rhesus factor: either
positive or negative. So there are actually eight types of blood a
human can have: one of the above types with a negative Rhesus
factor or with a positive Rhesus factor. Rhesus factor is a factor
which compares human blood to a Rhesus monkey's blood. A negative
result means your blood is not comparable to a Rhesus monkey.
Blood types are inherited from your parents. If one parent has
type A+, and the other has a B-, your blood type can either come
out as A, + or -, or B, + or -, or the rare AB, + or - but not O.
While type O negative is the universal donor, type AB positive is a
universal recipient.