DP Biology (first assessment 2025)

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Question 22M.1A.SL.TZ1.16

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1A.SL.TZ1.16
Level SL Paper 1A Time zone TZ1
Command term Question number 16 Adapted from N/A
16.
[Maximum mark: 1]
22M.1A.SL.TZ1.16

Huntington’s disease is an autosomal dominant genetic disease. What are the chances of two parents that are heterozygous for the gene having a child with Huntington’s disease?

A. 25 %

B. 50 %

C. 75 %

D. 100 %

[1]

Markscheme

C

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