DP Biology (first assessment 2025)

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Question 21N.1A.SL.TZ1.12

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Date November 2021 Marks available [Maximum mark: 1] Reference code 21N.1A.SL.TZ1.12
Level SL Paper 1A Time zone TZ1
Command term Question number 12 Adapted from N/A
12.
[Maximum mark: 1]
21N.1A.SL.TZ1.12

Huntington’s disease can develop in middle age and leads to death of brain cells. It is carried by an autosomal dominant gene. What can be deduced about a man who has the disease?

A. Half of his children will get the disease.

B. Neither of his parents had the disease, but one must have been a carrier.

C. At least one of his grandparents must have had the disease.

D. His sons are more likely to have the disease than his daughters.

[1]

Markscheme

C

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