Which of the following illustrates pleiotropy?

• A. In fruit flies, the genes for scarlet eyes and hairy body are located on the same chromosome.
• B. Matings between earless sheep and long eared sheep always result in short-eared offspring.
• C. Wheat kernels can range from white to red in color, a trait controlled by several genes.
• D. The human cystic fibrosis gene causes many symptoms, from respiratory distress to digestive problems.