Articles > Pleiotropy definition – quiz Pleiotropy definition – quiz Quiz Choose the best answer. 1. What is pleiotropy? Multiple genes affecting a single trait Multiple genes affecting multiple traits A single gene affecting a single trait A single gene affecting multiple traits 2. Which of the following is not an example of pleiotropy? Marfan syndrome Cystic fibrosis Albinism Skin pigmentation 3. The changes that occur in DNA sequences Mutations Epistasis Phenotype Polygene 4. The interaction of multiple genes in determining the phenotypic outcomes Mutations Epistasis Phenotype Polygene 5. A gene wherein its effect is too small to be observed but which can act together with others to generate an observable trait Mutations Epistasis Phenotype Polygene Send Your Results (Optional) Your Name To Email Time is Up!