Blood Type Codominance Practice Problems Worksheet With Answers Page 2
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25. A father is heterozygous for his type A blood and a mother is heterozygous for her type B blood.
a. What percentage of their offspring would you expect to have…
A
I
i
Type A Blood ___25___%
B
I
A
B
B
I
I
I
i
Type B Blood __25____%
i
A
I
i
ii
Type AB Blood ___25___%
Type O Blood __25____%
A
I
i
6. Mrs. Weasley has Type A blood but she is not sure if she is homozygous or
heterozygous. Mr. Weasley is completely unsure of his blood type. Their
A
B
B
B
children have the following blood types: Ron has Type O blood, Fred &
I
I
I
I
i
George have type A blood, Ginny has type B blood and Percy has type AB
blood. Show the cross to answer the following questions.
A
ii
I
i
i
A
a. What is Mrs. Weasley’s genotype?
___I
i
______
B
b. What is Mr. Weasley’s genotype?
___I
i_____
A
I
i
7. In 1968, a couple accused a hospital of switching their baby with
A
A
A
A
I
I
I
I
i
another. DNA fingerprinting did not exist at this time so the hospital traced the
blood types of the family in order to determine if a mistake was made. The
mother had type A blood, the father had type AB blood, and the baby had type
A
B
B
B
I
I
I
i
I
O blood. Use the punnett square to defend your answer to the following
question.
a. Did the hospital make a mistake and switch the baby? _yes!_
A
B
I
I
8. On a recent episode of CSI, multiple people came forward claiming to be
the parents of the victim. For the first set of parents, the man has type
A
B
I
i
I
i
i
AB blood, the woman has type O blood and yet the victim has type B
blood. Use the punnett square in order to determine if these people
A
B
could possibly be the parents of the victim.
I
i
I
i
i
a. Could these be the parents of the victim?
___yes!____
b. In the chart below, circle the other possible options for
Couple
Blood Types
the parents of the victim.
Bob and Gina
Type O and Type O
Ted and Susan
Type AB and Type
AB
Rob and Kelly
Type A and Type A
Tricia and James
Type A and Type B
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