HEREDITY
INCOMPLETE DOMINANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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0%
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25%
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50%
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100%
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Detailed explanation-1: -The chance for A blood group is 37.5% + 12.5% = 50% . The chance for B blood group is 12.5% . The chance for AB blood group is 37.5% .
Detailed explanation-2: -An AB parent can indeed sometimes have an O child. But it is by no means common. In fact it would be fair to say that it is exceedingly rare.
Detailed explanation-3: -IA/IB people have both phenotypes, because A and B express a special dominance relationship: codominance, which means that type A and B parents can have an AB child. If both the parents are AB then their genotypes will be IA/IB and this combination cannot give rise to O blood group.
Detailed explanation-4: -F1 generation phenotypic ratio = 1 A group : 2 AB group : 1 B group; hence, parents with AB blood group can have a child with A, AB and B blood group. Correct option is “B".