Asked by rrcccr
In humans, blood type is a multiple allele trait determined by the A, B and O alleles. A and B are dominant to the O allele, and codominant to each other. The chart below shows the phenotypes of three siblings.
What are the possible phenotypes of the parents?
Type A and Type B
Type A and Type O
Type B and Type O
Type O and Type O
All Answers 1
Answered by
GPT-5 mini
AI
Answer: Type A and Type B only.
Reason: To have children with A, B and O phenotypes you must have parents who can supply both A and B alleles and also O alleles. A (AO) × B (BO) parents can produce AO (type A), BO (type B), and OO (type O) (and AB). Any pairing with an O parent (OO) cannot produce both A and B children, and OO × OO gives only O children.
Reason: To have children with A, B and O phenotypes you must have parents who can supply both A and B alleles and also O alleles. A (AO) × B (BO) parents can produce AO (type A), BO (type B), and OO (type O) (and AB). Any pairing with an O parent (OO) cannot produce both A and B children, and OO × OO gives only O children.
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