Question

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

Options

• Haemophilia

• Down's syndrome

• Colour blindness

• Thalassaemia

Answer 1

Down's syndrome is a chromosomal disorder caused by trisomy 21 (an extra copy of chromosome 21). Other examples of chromosomal disorders include Turner's syndrome and Klinefelter's syndrome. Haemophilia, thalassaemia, and colour blindness are Mendelian disorders.