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Questions  

Multiple allelism and co-dominance are associated with

a
Starch branching gene in pea
b
ABO blood group system
c
Phenylketonuria
d
Flower colour in Snapdragon

detailed solution

Correct option is B

ABO blood group system in humans is controlled by an (I) gene having multiple alleles (IA ,IBand i) and the genotype IAIB shows co-dominance.Starch branching gene in pea is an example of pleiotropic gene.Phenylketonuria is an example of pleiotropy.Flower colour in Snapdragon show incomplete dominance.

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