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
Show Answer
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 $B$.
