The following shows a pedigree chart.

What type of inheritance is shown in this pedigree chart?
A. X-linked recessive
B. Y-linked dominant
C. X-linked dominant
D. Y-linked recessive

A

This question was a good discriminator with the majority of those getting this wrong incorrectly choosing D. Almost all were able to determine that the type of inheritance was recessive but the weaker candidates were not able to see whether it was X- or Y-linked.