Identify the incorrect statement w.r.t. polygenic inheritance.

• A

  Traits generally controlled by three or more genes and are thus called as polygenic traits.

• B

  Besides the involvement of multiple genes polygenic inheritance also takes into account the influence of environment.

• C

  Phenylketonuria is an example of polygenic trait.

• D

  In a polygenic trait the phenotype reflects the contribution of each allele, i.e., the effect of each allele is additive.