The position of a gene on a chromosome is called?

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

Answer: (C)

Think about where something sits on a chromosome. The fixed position of a gene is called its locus. This is the place on the chromosome where the gene is located, and it’s the reference point scientists use when mapping genes and studying how traits are inherited. A gene is the functional unit that can code for a product, a chromosome is the larger structure that carries many genes, and an allele is a different version of the same gene that can occupy that same locus in different individuals. So the position itself is described as the locus.