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
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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 GENETIC disorders — faults in the genes or chromosomes, inherited from the parents. Malaria and cholera are INFECTIOUS diseases caused by pathogens, and are caught rather than inherited.
THE STRATEGY: strike out any option containing malaria or cholera. That eliminates P and Q, and with them options (a), (c) and (d) — leaving (b) without any need to consider the disorders individually.
Worth knowing: colour blindness and haemophilia are SEX-LINKED, carried on the X chromosome, which is why both are far commoner in males. Albinism is autosomal recessive and affects both sexes equally.
This identical question appears in the 2026 paper, which tells you the distinction is considered important.
R and S.