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Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYPrinciples of Inheritance and Variation3 Marks
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.

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