There are three different alleles for blood-type: A, B, and O. A and B are dominant over O. If a person has A and B genes, he or she has blood-type AB. This is referred to as a codominant pattern of heredity.
Jane's mother and father have type B blood. When Jane's blood was tested, she found she had a blood-type of O. Select the best response from the options below.
Modes of Inheritance | BioNinja
a
Both parents are homozygous for type B blood.
b
One of them has a recessive gene for type O blood.
c
Both parents have a recessive gene for type O blood.
d
One of them is homozygous for type B blood.
c
Both parents have a recessive gene for type O blood.