What do genetics (DNA) determine?

• A. Only size
• B. Only color
• C. Many traits and characteristics
• D. Only behavior

Answer: (C)

DNA carries the instructions for making proteins that build and run the body, so genetics determine a wide range of traits. This means inherited features like eye color, hair type, height, and how certain body systems work, as well as patterns in disease risk, can be traced to genes. Since many traits involve multiple genes and can be influenced by the environment, the final traits you see come from both genetics and surroundings. Behavior is shaped by genes too, but environment and experiences play a big role, so DNA alone does not fix behavior. In short, genetics determine many traits and characteristics.