Codominance Worksheet (Blood types)Name ______________________________
Human blood types are determined by genes that follow the CODOMINANCE pattern of inheritance. There are two dominant alleles (IA and IB) and one recessive allele (i).
Blood Type (Phenotype)
Genotype
Can donate blood to:
Can receive blood from:
O
ii
A,B,AB and O
(universal donor)
O
AB
IAIB
AB
A,B,AB and O
(universal receiver)
A
IAIA or IAi
AB, A
O,A
B
IBIB or IBi
AB,B
O,B
Write the genotype for each person based on the description:
Homozygous for the “B” allele______
Heterozygous for the “A” allele______
Type O______
Type “A” and had a type “O” parent______
Type “AB”______
Blood can be donated to anybody______
Can only get blood from a type “O” donor______
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?
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
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:
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