What is the term for the location of a gene on a chromosome?

What is the term for the location of a gene on a chromosome?

• A. A science dealing with fossils
• B. The pairing of nucleobases
• C. The origin of replication
• D. The location of a gene on a chromosome

Answer: (D)

The location of a gene on a chromosome is called its locus. Think of a locus as the gene’s specific address on the chromosome, a defined position where that gene sits. Knowing the locus helps scientists map genes, compare their positions across individuals, and track how different versions (alleles) of the same gene vary at that spot. The other options describe concepts that aren’t about a gene’s position on a chromosome: fossils and paleontology, base pairing of nucleotides, and where DNA replication begins. These are important ideas, but they don’t answer where a gene is located.

The location of a gene on a chromosome is called its locus. Think of a locus as the gene’s specific address on the chromosome, a defined position where that gene sits. Knowing the locus helps scientists map genes, compare their positions across individuals, and track how different versions (alleles) of the same gene vary at that spot. The other options describe concepts that aren’t about a gene’s position on a chromosome: fossils and paleontology, base pairing of nucleotides, and where DNA replication begins. These are important ideas, but they don’t answer where a gene is located.