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Question 18M.1.HL.TZ2.20

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.1.HL.TZ2.20
Level HL Paper 1 Time zone TZ2
Command term Question number 20 Adapted from N/A
20.
[Maximum mark: 1]
18M.1.HL.TZ2.20

Nail patella syndrome is a rare disease that causes abnormalities of the nails and some bones. Its alleles are linked to the blood group alleles on the same chromosome. The pedigree chart shows the inheritance of these two characteristics over three generations.

[Source: Copyright © 1998. Phillip McClean]

Which descendant represents a recombinant phenotype?

 

[1]

Markscheme

C

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