A) 1
B) 2
C) 3
D) 4
Correct Answer: C
Solution :
Some traits have genes with more than two alleles but anyone individual can still have only two alleles (one on each of the homologous chromosome). In human blood group there are three alleles\[{{I}^{A}},{{I}^{B}},{{I}^{1}}\]. Since, any individual has only two alleles there are four possible blood groups.
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