Blood type inheritance practice
l. Human blood types is an example of a multiple allele system. Fill in the table below, showing wh at
genotype(s) is/are associated with each phenotype. Use io = type 0, IA = type A, IB = type B.
Remember blood type is an example of codominance.
Genotype(s) (list all possibilities)
Blood Phenotype
A
B
AB
O
2. A woman who is type O marries a man who is heterozygous for type A. What are the chances t h a t
they will have a type O baby?
3. A person with blood type O marries a person with blood type AB. List the possible blood types in
offspring.
4) A father has type O blood and a mother is heterozygous for type B blood. What blood types can their
children have?
5. What genotypes must parents have in order to produce four different phenotypic blood types?
6) Suppose two newborn babies were accidentally mixed up in the hospital. In an effort to determine the
parents of each baby, the blood types of the babies and the parents were determined.
Baby 1: Type O
Mrs. Brown: Type B & Mr. Brown: Type AB
Baby 2: T y p e A
Mrs. Smith: Type B & Mr. Smith: Type B
a. W h i c h p a r e n t s c a n Baby l belongs to?
b. Which parents can Baby 2 belong to?
(Hint: List the possible Genotypes for each individual parent and then make all the possible Punnett
Square for each p a r e n t a l c o m b i n a t i o n )
7) You ‘re working in the Emergency room and a bleeding patient with Type B blood is brought in.
You need to give him blood but the hospital is all out of Type B. Name the type of blood that you could
safely give to him instead and explain your choice.
8) What if the bleeding patient had type AB blood and the hospital was out of AB blood. Name ALL
the types of blood you could safely give him and explain your choice)