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Question 19M.1A.SL.TZ2.14

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1A.SL.TZ2.14
Level SL Paper 1A Time zone TZ2
Command term Deduce Question number 14 Adapted from N/A
14.
[Maximum mark: 1]
19M.1A.SL.TZ2.14

The pedigree chart shows a family affected by cystic fibrosis.

[Source: © International Baccalaureate Organization 2019]

 

What is the genotype of the affected boy’s father?

A. AA only

B. Either AA or Aa

C. Aa only

D. aa only

[1]

Markscheme

C

Examiners report

This was a good question, it discriminated very well and was not too difficult.

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