Which statement best describes the relationship among the terms gene, locus, and allele?

• A. A locus is a type of gene, and alleles are the proteins produced by that gene.
• B. An allele is a location on a chromosome, while a gene is one possible sequence at that location.
• C. Genes and alleles are identical, and locus refers to the entire chromosome.
• D. A gene is a segment of DNA located at a specific locus, and different alleles are alternative forms of that gene found at the same locus.

Answer: (D)

Verified step by step guidance

1. Step 1: Understand the definition of a gene. A gene is a segment of DNA that contains the instructions to make a specific protein or RNA molecule.
2. Step 2: Define locus. A locus is the specific physical location or position of a gene on a chromosome.
3. Step 3: Define allele. An allele is one of the different versions or alternative forms of a gene that can exist at a particular locus.
4. Step 4: Recognize the relationship: each gene occupies a specific locus on a chromosome, and at that locus, there can be multiple alleles representing variations of that gene.
5. Step 5: Summarize the relationship: a gene is a DNA segment at a locus, and alleles are the variant forms of that gene found at the same locus.