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ICSE Question Bank
2019Q1(f)(iv)Genetics – Some Basic Fundamentals
Odd one outEasy1 mark
1(f)

Identify the ODD term in each set and name the CATEGORY to which the remaining three belong. Example: glucose, starch, cellulose, calcium — Odd term: calcium; Category: the others are different types of carbohydrates.

Chicken pox, Colour blindness, Haemophilia, Albinism.

Topic: Genetic disorders

Previous-year question practice database

Answer

Exam answer

Odd term: CHICKEN POX. Category of the others: GENETIC DISORDERS.

Explanation

Colour blindness, haemophilia and albinism are GENETIC disorders — caused by faults in the genes and INHERITED from the parents.

CHICKEN POX is an INFECTIOUS disease, caused by a virus and CAUGHT from another person.

THE DISTINCTION being tested is INHERITED versus CAUGHT, and it is the same distinction the 2024 and 2026 papers test with malaria and cholera. Whenever a list mixes disorders, ask first whether each is passed down or picked up.

Worth adding: colour blindness and haemophilia are SEX-LINKED (carried on the X chromosome, so commoner in males), while albinism is AUTOSOMAL recessive and affects both sexes equally.

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