Question

Katie and her sister have entirely different features and traits. Katie has blond hair and brown eyes, but her sister has red hair and blue eyes. What causes these variations in traits such as hair color, eye color, and height?

A. competition
B. offspring
C. alleles
D. fitness

Answer 1

C. Alleles

Step-by-step explanation:

Our genes are responsible for our phenotype (physical traits). Alleles is the only genetic term in there.