Multiple choice

A position on a chromosome occupied by a gene is:

  1. locus

  2. centromere

  3. chromosome

  4. allele

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A locus is the specific fixed position on a chromosome where a particular gene is located. Each gene occupies its own locus, and different alleles of that gene occupy the same locus on homologous chromosomes. Centromeres are chromosome constriction points, while alleles are gene variants, not positions.