Question

Which Mendelian disorders are classified as X-linked recessive?

Options

• Haemophilia and Colour blindness

• Colour blindness and Thalassaemia

• PKU, Sickle-cell anaemia, Thalassaemia, and Albinism

• Sickle-cell and Haemophilia

Answer 1

X-linked recessive Mendelian disorders include Haemophilia and Colour blindness. These conditions are caused by mutations in genes located on the X chromosome and predominantly affect males because they have only one X chromosome.