Question

Colour blindness is a ______ disease which causes inability in a person to distinguish different colours.

Options

• sex-linked dominant

• sex-linked recessive

• sickle cell anaemia

• Down's syndrome

Answer 1

Colour blindness is a sex-linked recessive disease which causes inability in a person to distinguish different colours.

Explanation:

Colour blindness is a sex-linked recessive genetic disorder because the defective gene responsible for it is located on the X chromosome and expresses itself only when it is present in a homozygous condition in females or a hemizygous condition in males.