Blood Type Codominance Practice Problems Worksheet With Answers
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1
2Blood Type Codominance Practice Problems
Human blood types are determined by genes that follow the CODOMINANCE pattern of inheritance. There are
two equally dominant alleles (A and B) and one recessive allele (O).
1. Fill in the following chart with the missing information.
Blood Type
Possible Genotype(s)
Can donate blood to:
Can receive blood from:
(Phenotype)
O
ii
A, B, AB, O
O
(“universal donor”)
A
B
AB
AB
I
I
A, B, AB, O
(“universal recipient”)
A
A
A
O , A
A
I
I
, I
i
AB , A
B
B
B
B
I
I
, I
i
AB , B
O , A
2. Write the genotype for each person, based on the given description.
B
B
A
Homozygous for Type B Blood ____
I
I
______
Heterozygous for Type A Blood ____
I
i
______
A
Type O Blood ____ii______
Type A Blood and had a parent with Type O Blood ___
I
i
____
A
B
Type AB Blood ____
I
I
______
Blood can be given to any individual ____ii______
B
A
A
Heterozygous for Type B Blood ____
I
i
____
Homozygous for Type A Blood ____
I
I
______
Can only receive blood from a Type O donor _____ii_____
B
i
I
3. A father is heterozygous for his type B blood (BO) and the mother has
ii
i
B
I
i
type O blood.
a. What are the possible blood types of the babies born from this
couple?
Type B and Type O
B
i
I
i
ii
4. A father has type AB blood and the mother has type O blood.
A
B
I
I
a. What percentage of their offspring would you expect to have…
Type A Blood ___50___%
A
B
I
i
I
i
i
Type B Blood __50____%
A
B
i
I
i
I
i
Type AB Blood ___0___%
Type O Blood __0____%
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