| Date | May 2018 | Marks available | 1 | Reference code | 18M.1.HL.TZ2.20 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 20 | Adapted from | N/A |
Question
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?
Markscheme
C
Examiners report
[N/A]
