Step 1: Understanding the Concept:
Personality is shaped by three main determinants: Heredity (biology), Environment (culture/family), and Situation (experience).
Step 2: Detailed Explanation:
Heredity refers to the genetic factors that are passed from parents to children at the time of conception. Physical traits such as eye color, facial features, height, and biological temperament are predetermined by these genetic codes.
Culture and Family Background shape behavior and values, while Experience shapes how we react to the world.
Step 3: Final Answer:
Physical characteristics like eye color and body shape are governed by Heredity.