What is a gene?

What is a gene?

• A. A factor passed from one generation to determine a trait.
• B. A form of a protein.
• C. A chromosome segment.
• D. A genome.

Answer: (A)

Genes are units of heredity that are passed from parents to offspring and influence traits. Historically, they were described as factors that determine a trait, which captures the essence of inheritance across generations. While genes are located on chromosomes and can code for proteins or RNA, the important idea for this definition is that a gene is the inherited unit that can affect how an organism looks or functions. Saying a gene is a factor passed from one generation to determine a trait addresses both transmission and influence, making it the best fit. A form of a protein isn’t exact because a gene is not itself a protein, even though it can encode one. A chromosome segment is related but incomplete, since not every segment is a gene and a gene is defined by its function as a hereditary unit. A genome refers to the entire genetic material, not a single unit.

Genes are units of heredity that are passed from parents to offspring and influence traits. Historically, they were described as factors that determine a trait, which captures the essence of inheritance across generations. While genes are located on chromosomes and can code for proteins or RNA, the important idea for this definition is that a gene is the inherited unit that can affect how an organism looks or functions. Saying a gene is a factor passed from one generation to determine a trait addresses both transmission and influence, making it the best fit. A form of a protein isn’t exact because a gene is not itself a protein, even though it can encode one. A chromosome segment is related but incomplete, since not every segment is a gene and a gene is defined by its function as a hereditary unit. A genome refers to the entire genetic material, not a single unit.