Phenotype questions?

Question

BLOOD TYPE A:

genotypes?

can give blood to?

can receive blood from?

BLOOD TYPE B:

genotypes?

can give blood to?

can receive blood from?

BLOOD TYPE AB:

genotypes?

can give blood to?

can receive blood from?

Answer 1

I'll help you with one so you can see how to do the others.

Things to remember in the ABO blood types:
1) there are always TWO genes involved
2) A and B are named because they produce certain proteins. O doesn't produce either protein. If a blood type that makes a protein is given to a person who doesn't make that type of protein, their blood can clot and the person could die.

BLOOD TYPE A:

genotypes: to make the protein for "A" the person needs at least one of the two genes to be an "A". The second one can't be a "B" because that would show up and their blood type wouldn't be "A". So the person could be "AA" (both genes for "A") or "AO", since the "O" doesn't produce anything, only the "A" shows up in testing.

can give blood to: Since the only protein they make is for "A", they can give blood to any person where an "A" shows up - either another type "A" or a type "AB"

can receive blood from: They can only get blood from a person who's type doesn't produce proteins other than "A", so they could receive blood from another person with type "A", but also from a type "O" (no proteins are produced).