Read the following statements and choose the correct option.
I. In phenylketonuria the affected person does not secrete the enzyme to convert phenylalanine to tyrosine.
II. Possibility of male becoming haemophilic is extremely rare.
III. Sickle cell anaemia is caused by the substitution of glutamic acid by valine at fifth position of beta chain of haemoglobin.
IV. Myotonic dystrophy is an autosomal dominant trait

Options

A. I and III alone are wrong
B. II and III alone are wrong
C. II alone are wrong
D. III alone is wrong

Answer

B

Explanation

• Possibility of female becoming haemophilic is extremely rare.
• Sickle cell anaemia is caused by the substitution of glutamic acid by valine at sixth position of beta chain of haemoglobin.