question_answer

Sickle cell anaemia is due to:

A)  Change of amino acid in\[\alpha -\]chain of hae- moglobin

B)  Change of amino acid in\[\beta -\]chain of haemoglobin                           

C)  Change of amino acid in both\[\alpha \]and \[\beta \]chain of haemoglobin               

D)  Change of amino acid either\[\alpha \]or\[\beta \]chain of haemoglobin