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Standard VIII

Biology

Blood Group

In the ABO bl...

Question

In the ABO blood groups inheritance, the A and B alleles are co-dominant, and O is recessive to both the A and B alleles. If a man with type B blood and a woman with type A blood marry, the phenotype of their children could be

A only

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B only

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AB only

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A, B or AB

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A, B, AB or O

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Solution

The correct option is E A, B, AB or O
Human blood group inheritance is the example of codominance and multiple alleles. It is governed by three alleles namely I $^{A}$ , I $^{B}$ and i. I $^{A}$ and I $^{B}$ show codominance while allele 'i' is recessive to both 'I $^{A}$ ' and 'I $^{B}$ '. Man with B blood group can have (I $^{B}$ I $^{B}$ and I $^{B}$ i) genotypes while woman with A blood group can have (I $^{A}$ I $^{A}$ and I $^{A}$ i) genotypes. Presence of all three alleles in the couple make it possible to have them children with all four possible phenotypes.
Therefore, the correct answer is option E.

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Similar questions

Q. Human blood type is determined by codominant alleles. There are three different alleles, known as

I^{A}

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The possible human phenotypes for blood group are type A, type B, type AB, and type O. Type A and B individuals can be either homozygous (

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