ABO blood group system is an example of

incomplete dominance

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multiple allelism

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epistasis

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pleiotropy

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Solution

The correct option is B multiple allelism
The gene for the determination of blood group in ABO system has 3 alleles (multiple allelism):
$I^{\circ} / i, I^{A} / A, I^{B} / B$ .

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ABO blood group is an example of?

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