A locus is

  1. a type of chromosome
  2. an alternative form of a gene
  3. a pair of alleles
  4. the position of a gene on a chromosome
Answer

D) the position of a gene on a chromosome

Definition of locus. AS & A Level Biology · Topic 16 Inheritance · 16.2 The roles of genes in determining the phenotype

Biology MCQ · More A Level Biology: Inheritance MCQs · Practise