Question

What is a pleiotropic gene ?

Answer 1

Pleiotropy occurs when one gene influences two or more seemingly unrelated phenotypic traits. Consequently, a mutation in a pleiotropic gene may have an effect on some or all traits simultaneously. An example is phenylketonuria, a human disease that affects multiple systems but is caused by one gene defect.

Answer 2

A pleiotropic gene is a gene that influence not only the traits associated with them but also other traits.