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Practice problem

Pedigree — Definition & Charts

By Gabi Slizewska

A pedigree of House Lannister for a certain trait. Tytos who doesn't have the trait has children with Jeyne who does have the trait. Their kids are Tywin and Kevan and both do not have the trait. Kevin has children with Dorna who doesn't have the trait either. Their kids are Lancel, Martyn, and Willem and none have the trait. Tywin has kids with Joanna who doesn't have the trait either. Their kids are Cersei, Jaime, and Tyrion and none have the trait. Cersei marries Robert but also has children with her brother Jamie. Their kids are Joffrey, Tommen, and Myrcella. All three kids have the trait.

The pedigree above shows the inheritance of a certain trait through the generations of House Lannister. What is the most likely mode of inheritance for this trait?