Question

_____ controls the expression of a trait or character.

• A. Chromosomes
• B. Cell
• C. Gene
• D. Nucleus

Hint:

Gene = Unit of heredity Genes are located on chromosomes and determine the traits of an organism.

Answer 1

The Correct Option is C

Concept: Genes are the fundamental units of heredity present on chromosomes. They carry genetic information responsible for determining traits and characters in living organisms. Examples of traits controlled by genes include:
• Eye color
• Hair type
• Height
• Blood group

Step 1: Understanding the role of genes. A gene contains instructions for the development and expression of specific characteristics. Therefore: \[ \boxed{\text{Gene controls the expression of a trait}} \]

Step 2: Elimination of incorrect options.
• Option (1) Chromosomes: Chromosomes contain many genes but do not individually represent a specific trait-controlling unit.
• Option (2) Cell: Cell is the structural and functional unit of life, not specifically responsible for trait expression.
• Option (4) Nucleus: The nucleus stores genetic material but genes specifically control characters. Hence, the correct answer is: \[ \boxed{(3)\ \text{Gene}} \]