Question

A child has blood group O. If the father has blood groupA and the mother has blood B. Work out the genotype of parent and the possible phenotype and genotype of the offspring.

Answer 1

If a child have blood group O then the father may have the blood group A or B or O .and the same with the mother . Because if the A blood group Will be recessive then the O will be dominant.As a result the child has the blood group O.
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Answer 2

hey mate!

father's blood group is A

it may be hoMogyros A
iAIA

or may be heterozygous A
iAio.

mothers blood group given is B

homoCygnus
iBiB
heterozygous
ibiO

child has blood grope only if both father and mother are heterozygous of there rrdpective blood groups