Select the correct answers to the questions from the given options. (Do not copy the questions, write the correct answer only.)
Four friends P, Q, R, and S were discussing the examples of genetic disorders. The examples they quoted were as follows: P. Colour blindness and Malaria Q. Albinism and Cholera R. Haemophilia and Colour blindness S. Haemophilia and Albinism Who gave the correct examples?
Topic: Genetic disorders vs infectious diseases
Try it
Pick an option and check your answer. The full worked answer is below either way.
Answer
(b) R and S.
Haemophilia, colour blindness and albinism are all GENETIC disorders — they arise from faults in the genes or chromosomes and are inherited from the parents. Malaria and cholera are INFECTIOUS diseases, caused by pathogens (a protozoan and a bacterium), and are caught, not inherited.
THE STRATEGY: the question tests one distinction only — inherited versus caught. Strike out any option containing malaria or cholera and you eliminate P and Q at once, which removes options (A), (C) and (D) without needing to think about the disorders themselves.
Worth knowing: colour blindness and haemophilia are SEX-LINKED (carried on the X chromosome), while albinism is autosomal recessive.
R and S.