Sickle cell anaemia is caused by the substitution of ________.

Question

Valine at the 6^th position of the alpha-globin chain by glutamic acid

Glutamic acid at the 6^th position of the beta-globin chain by valine

Valine at the 6^th position of the beta-globin chain by glutamine

Glycine at the 6^th position of the alpha-globin chain by glutamic acid

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