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.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.