Multiple Alleles (ABO Blood Types) and Punnett Squares

What is the primary reason blood types must be carefully matched before a transfusion?

• To prevent blood from clotting in the veins.

• To ensure the blood carries enough oxygen.

• To avoid an immune system attack on foreign antigens.

• To maintain proper blood pressure.

Which blood type is considered the universal recipient for red blood cell donations?

• Type A

• Type B

• Type AB

• Type O

What are the possible genotypes for an individual with Type B blood?

• I^A I^A or I^A i

• I^B I^B or I^B i

• I^A I^B

• ii

A couple both have Type A blood. Is it possible for them to have a child with Type O blood?

• No, because Type A is dominant over Type O.

• Yes, if both parents are heterozygous (I^A i).

• No, because Type O blood has no antigens.

• Yes, if one parent is homozygous (I^A I^A) and the other is heterozygous (I^A i).