Principles of Inheritance and Variation Question 110

110. ABO blood group system is due to

[1990]

(a) multifactor inheritance

(b) incomplete dominance

(c) multiple allelism

(d) epistasis

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Answer : c

Hints & Solution

(c) A gene may have more than two alternative forms occupying the same locus on a chromosome. Such alleles are known as multiple alleles and the phenomenon is termed as multiple allelism. ABO blood group has 3 alleles- $I^{O}, I^{A}$ or $A, I^{B}$ or $B$.