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(1)If the father is AO type and the mother is AO type, the child’s genes are AAOOOO.
(2)You can do it. Type A is dominant over type O, so type AA and type AO.
(3)is determined to be type A and type OO is determined to be type O.
(4)Therefore, IU is type OO, and her younger brother is type AO or type AA.
That’s what he said.