2. Blood-typing genetics problems
Copy the following table to you science notebooks! :-)

3. A AA,AO B BB,BO AB O OO A, AB O, A 39 B, AB O, B 12 O, A, B, and AB 4
Blood phenotypes
Blood- genotypes
Can Give Blood To
Can Receive Blood From
Frequency of Blood Type in US % A
AA,AO
A, AB
O, A 39 B
BB,BO
B, AB
O, B 12 AB
O, A, B, and AB 4 O OO
O, A, B and AB 45

4. Most genes have more than two alleles in a population.
The ABO blood groups in humans are determined by three alleles, A, B, and O.
Both the A and B alleles are dominant to the O allele
The A and B alleles are co-dominant to each other.
Because each individual carries two alleles, there are six possible genotypes and four possible blood types.

5. Matching compatible blood groups is critical for blood transfusions because a person produces antibodies against foreign blood factors.
If the donor’s blood has an A or B oligosaccharide that is foreign to the recipient, antibodies in the recipient’s blood will bind to the foreign molecules, cause the donated blood cells to clump together, and can kill the recipient.
Remember to copy the preceding table for future reference :-)