Haemophilia is a genetic disorder that affects the blood's ability to clot. This disorder is linked to the X chromosome and is more common in males than females. The correct option related to haemophilia is B) Colour blindness.

Explanation:
Haemophilia is caused by a deficiency or absence of clotting factors in the blood. These clotting factors are essential for the blood to clot properly when there is an injury or cut. There are two types of haemophilia: Haemophilia A (due to Factor VIII deficiency) and Haemophilia B (due to Factor IX deficiency).

Colour blindness, on the other hand, is an inherited condition that affects the ability to distinguish between different colours. This condition is also linked to the X chromosome and is more common in males than in females. Colour blindness occurs when certain cells in the retina, called cone cells, do not function properly.

Both haemophilia and colour blindness are X-linked recessive disorders, which means that the faulty gene is located on the X chromosome. Males have only one X chromosome, so if they inherit a faulty X chromosome from their mother, they will have the disorder. Females have two X chromosomes, so even if they inherit a faulty X chromosome, they may have another normal X chromosome that can compensate for the faulty one.

In conclusion, haemophilia and colour blindness are both genetic disorders that are linked to the X chromosome. While haemophilia affects the blood's ability to clot, colour blindness affects the ability to distinguish between different colours.