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game of thrones - Genetic Inheritence in Westeros


In season one of the TV show, Eddard Stark discovers the book which the previous Hand was after. It contains the family trees and descriptions of the houses of Westeros; he discovers that people from house Baratheon usually are dark-haired. However, Joffrey is blonde. Eddard seems to conclude that Robert cannot be Joffrey's father.


If I recall correctly, this conclusion is incorrect according to human genetics; the dark-haired Robert and the blonde Cersei could very well have blonde children. Is this true? Does human heredity simply work differently in Westeros?




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