When two genes are linked on the same autosome, a dihybrid test cross produces

  1. 9 : 3 : 3 : 1
  2. mostly parental phenotypes with few recombinants
  3. only recombinants
  4. exactly 1 : 1 : 1 : 1
Answer

B) mostly parental phenotypes with few recombinants

Linked genes stay together unless crossed over. 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