Multiple choice Which of the following diseases is/are hereditary? Down's syndrome Colour blindness Sickle cell anaemia Only 1 and 2 Only 2 and 3 Only 1, 2 and 3 Only 1 and 3 Only 2 Reveal answer Fill a bubble to check yourself C Correct answer Explanation Down's syndrome, colour blindness and sickle cell anaemia are hereditary diseases.