Answer:
C. one gene influences multiple traits.
Step-by-step explanation:
Pleiotropy can be defined as a phenomenon in genetics whereby one particular gene in the affects or influences multiple phenotypic traits expressed in the human body.
Pleiotropy can result in the occurrence of disorders in a human body. An example of Pleiotropy is Phenylketonuria.
Phenylketonuria is a human or animal disorder occurs due to the build of the amino acid phenylalanine in the body. This could result serious neurological to the brain such as seizures, damages to the intellectual capacity of the brain e.t.c.
Another symptom of Phenylketonuria is the presence of fair skin and blue eyes because the body was unable to convert or transform phenylalanine to melanin (which gives pigmentation to the body)