Codominance Worksheet (Blood Types)
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1
2Codominance Worksheet (Blood types)
Name ______________________________
Human blood types are determined by genes that follow the CODOMINANCE pattern of inheritance.
A
B
There are two codominant alleles (I
and I
) and one recessive allele (i).
Blood Type
Genotype
Can donate blood to:
Can receive blood from:
(Phenotype)
O
ii
A, B, AB and O
O
(Everyone, so: universal donor)
A
B
AB
I
I
O, AB
A,B,AB and O
(Everyone, so: universal receiver)
A
A
A
A
I
I
or I
i
AB, A
O,A
B
B
B
B
I
I
or I
i
AB, B
O,B
1.
Write the genotype for each person based on the description:
a.
Homozygous for the “B” allele
______
b.
Heterozygous for the “A” allele
______
c.
Type O
______
d.
Type “A” and had a type “O” parent
______
e.
Type “AB”
______
f.
Blood can be donated to anybody
______
g.
Can only get blood from a type “O” donor
______
2.
Pretend that Brad Pitt is homozygous for the type B allele, and Angelina Jolie is type “O.” What
are all the possible blood types of their baby?
3.
Draw a Punnett square showing all the possible blood types for the offspring produced by a type
“O” mother and an a Type “AB” father
4.
Mrs. Clink is type “A” and Mr. Clink is type “O.” They have three children named Matthew,
Mark, and Luke. Mark is type “O,” Matthew is type “A,” and Luke is type “AB.” Based on this
information:
a.
Mr. Clink must have the genotype ______
b.
Mrs. Clink must have the genotype ______ because ___________ has blood type ______
c.
Luke cannot be the child of these parents because neither parent has the allele _____.
5.
Two parents think their baby was switched at the hospital. Its 1968, so DNA fingerprinting
technology does not exist yet. The mother has blood type “O,” the father has blood type “AB,”
and the baby has blood type “B.”
a.
Mother’s genotype: _______
b.
Father’s genotype: _______
c.
Baby’s genotype: ______ or ________
d.
Punnett square showing all possible genotypes for children produced by this couple
e.
Was the baby switched?
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