Question
Inheritance pattern of ABO blood groups in humans shows dominance, codominance and multiple allelism. Explain each concept with the help of blood group genotypes.
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Answer
In the first case of inheritance of blood group there are three alleles $I^A, I^B$ and $i$ out of which we inherit any two of them - multiple allelism.In case of $A B$ group the alleles are $I^A$ and $I^B$ and both are expressed - codominance.
In case of $I^{\mathrm{A}} \mathrm{i}$ and $\mathrm{I}^{\mathrm{B}} \mathrm{i}$ which are heterozygous the dominant gene expresses - law of dominance.
In case of $I^{\mathrm{A}} \mathrm{i}$ and $\mathrm{I}^{\mathrm{B}} \mathrm{i}$ which are heterozygous the dominant gene expresses - law of dominance.
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