HEREDITY
INCOMPLETE DOMINANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A woman heterozygous for type A blood marries a man heterozygous for B blood. What is the probability they will produce offspring with AB blood?
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0&
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25%
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50%
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75%
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Explanation:
Detailed explanation-1: -Since the mother has A blood group, the child can not be homozygous for B blood group. The reason is that he will receive one IB allele from father with B blood group but the mother with A blood group can transmit only IO allele for the child to have B blood group. Hence the genotype of child will be IB IO.
Detailed explanation-2: -Men with B+ blood group can marry women with O+ blood group.
Detailed explanation-3: -The genotypes of the two parents are AO and BO.
Detailed explanation-4: -Heterozygous means one dominant & one recessive allele. Since they are Type “B", the dominant allele is IB, & the only recessive allele for blood type is “i". So the both parents are IBi, & the cross is IBi x IBi.
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