निम्नलिखित में से कौन सा लक्षण मुख्य रूप से और पूरी तरह से जैविक आनुवंशिकता (heredity) द्वारा निर्धारित होता है?

Heredity is an important subject in psychology and biology. Which of the following is NOT a recognized law or principle of heredity?

Read the following statements: Assertion (A): Some children have traits that closely resemble their parents, while others are distinctly different from their parents. Reason (R): Determining how much a trait is due to heredity and how much is due to environment is a complex issue. Choose the correct option.