Let's say that Robert Baratheon, despite being king, was unlucky enough to be heterozygous from Huntington's disease and heterozygous polycystic kidney disease-2 (caused by a mutation in the Polycystin-2 gene). However, being king allowed him to have many children with multiple concubines, none of which had any alleles for these diseases. Of the 16 children he fathered, 6 didn't inherit any disease while the other 7 inherited both, and 3 only inherited either one of the diseases.
- Did Robert inherit both diseases from the same parent or could he have inherited one disease from each parent? Explain.