Which statement about pleiotropy is true?
A) It involves the expression of an allele.
B) It is observed only after dihybrid crosses.
C) It is observed only after test crosses.
D) It must involve several genes.
E) It is caused by incomplete dominance.

Question

Quizplus · Accepted Answer

Pleiotropy involves a single gene affecting multiple traits, and therefore involves the expression of an allele.

Answer: D
 Pleiotropy can involve multiple traits controlled by a single gene, and therefore must involve several genes.

Answer: E
 Pleiotropy is not caused by incomplete dominance, which involves a blending of traits.

Which Statement About Pleiotropy Is True