Start learning →

Sickle cell anaemia is caused by:

AA point mutation in the β-globin gene
BAn extra chromosome 21 (trisomy 21)
CAn extra X chromosome in males
DA deletion of the Y chromosome in males
Answer & Solution
Correct answer: A. A point mutation in the β-globin gene
Sickle cell anaemia = point mutation in the β-globin gene (GAG to GTG, glutamic acid to valine). HbS replaces HbA, causes RBCs to sickle in low oxygen. Autosomal recessive.
Practise this question with Quill — AP Intermediate 2nd Year →

Keep practising Genetics and Evolution

Browse all Genetics and Evolution questions for AP Intermediate 2nd Year, or explore more Biology topics.

Start a Genetics and Evolution lesson →