Question

Which of the following is an example of a Mendelian disorder?

Options

• Klinefelter's syndrome

• Haemophilia

• Down's syndrome

• Turner's syndrome

Answer 1

Haemophilia is a Mendelian disorder caused by a mutation in a single gene. Other examples of Mendelian disorders include thalassaemia, sickle-cell anaemia, colour blindness, and phenylketonuria. Down's, Turner's, and Klinefelter's syndromes are chromosomal disorders.