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a
Phenylketonuria is an example of polygenic trait.
b
Traits generally controlled by three or more genes and are thus called as polygenic traits.
c
Besides the involvement of multiple genes polygenic inheritance also takes into account the influence of environment.
d
In a polygenic trait the phenotype reflects the contribution of each allele, i.e., the effect of each allele is additive.
answer is C.
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