________are small units that contain information about the traits of a person

Options

A. DNA
B. Genes
C. Antibody
D. Antigen

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for small units that contain information about the traits of a person. This indicates that we are looking for a biological term related to genetics.

2. **Identifying Key Terms**: The options provided are DNA, genes, antibodies, and antigens. We need to analyze each option to determine which one fits the description of "small units that contain information about the traits of a person."

3. **Analyzing DNA**: DNA (Deoxyribonucleic Acid) is the genetic material found in the nucleus of cells. It carries the genetic instructions for the development, functioning, growth, and reproduction of all known organisms. However, DNA itself is not considered a "small unit."

4. **Analyzing Genes**: Genes are segments of DNA that contain the instructions for making proteins, which play a crucial role in determining the traits of an organism. Genes are indeed small units that carry specific information about traits.

5. **Analyzing Antibodies**: Antibodies are proteins produced by the immune system to help fight off infections. They do not contain information about traits.

6. **Analyzing Antigens**: Antigens are substances that induce an immune response, often recognized by antibodies. They also do not contain information about traits.

7. **Conclusion**: After analyzing all the options, the correct answer is "genes," as they are the small units that contain information about the traits of a person.

**Final Answer**: Genes are small units that contain information about the traits of a person.

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