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ICSE Question Bank
2016Q1(c)(v)Genetics – Some Basic Fundamentals
Odd one outEasy1 mark
1(c)

In each set of terms given below, there is an odd one and cannot be grouped in the same category to which the other three belong. Identify the odd term in each set and name the category to which the remaining three belong. Example: Ovary, Fallopian tube, Ureter, Uterus. Odd term: Ureter. Category: Parts of female reproductive system.

Typhoid, Haemophilia, Albinism, Colour blindness.

Topic: Genetic diseases

Previous-year question practice database

Answer

Exam answer

Odd term: TYPHOID. Category of the others: GENETIC DISEASES.

Explanation

Haemophilia, albinism and colour blindness are all GENETIC disorders — caused by faults in the genes and INHERITED from the parents.

TYPHOID is an INFECTIOUS disease caused by the bacterium Salmonella typhi, spread through contaminated food and water. It is CAUGHT, not inherited.

THE DISTINCTION being tested is INHERITED versus CAUGHT, and it appears in the 2019, 2024 and 2026 papers as well, with malaria, cholera and chicken pox in place of typhoid. Whenever a list mixes disorders, ask first whether each is passed down or picked up.

Worth adding: haemophilia and colour blindness 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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