What is the term for a segment of DNA that participates in controlling the expression of a trait and resides at a chromosome location?

What is the term for a segment of DNA that participates in controlling the expression of a trait and resides at a chromosome location?

• A. Gene
• B. Allele
• C. Chromosome
• D. Chromatin

Answer: (A)

A gene is a specific stretch of DNA that carries the instructions to produce a product (a protein or a regulatory RNA) that influences a trait, and it sits at a particular spot on a chromosome called a locus. This is what ties the DNA sequence to the expression of a phenotype. An allele is simply a variant form of that same gene, not the segment itself. A chromosome is the larger structure that houses many genes, while chromatin refers to the DNA wrapped with proteins inside the nucleus. So the term that best fits both being a DNA segment and controlling a trait at a chromosome location is gene.

A gene is a specific stretch of DNA that carries the instructions to produce a product (a protein or a regulatory RNA) that influences a trait, and it sits at a particular spot on a chromosome called a locus. This is what ties the DNA sequence to the expression of a phenotype. An allele is simply a variant form of that same gene, not the segment itself. A chromosome is the larger structure that houses many genes, while chromatin refers to the DNA wrapped with proteins inside the nucleus. So the term that best fits both being a DNA segment and controlling a trait at a chromosome location is gene.