As I understand it, the reason the simplistic approach doesn’t quite work is because the knowledge that a genetic combination produced a functioning adult allows you to update on the total degree of sharing / whether or not any of the ruinous parts were shared.
In related news, check out MawBTS’s comment on this Cochran post on inbreeding, on Cleopatra’s ancestry. Yikes.
As I understand it, the reason the simplistic approach doesn’t quite work is because the knowledge that a genetic combination produced a functioning adult allows you to update on the total degree of sharing / whether or not any of the ruinous parts were shared.