Genes exhibiting multiple effects are known as

$A$ pleiotropic gene

Observe the phenotypic effects of a gene with $2$ alleles $B$ and $b$ in pea plant.

Genotype	Starch grain size and Seed shape
$BB$	Large,Round
$Bb$	Intermediate,Round
$bb$	Small,Wrinkled

Which of the following is incorrect in concern to above facts $:-$

$A$ pleiotropic gene is one which

When one gene controls two or more different characters simultaneously,the phenomenon is called

The gene disorder phenylketonuria is an example of