Subject: How many generations of inbreathing can a few-inhabitant 'tribe' cope whith

Hi! I have difficault to see why inbreathing is so horrible (I´m not for it, 
just interested in the question because it´s so tabu).
If a daughter have a baby with her father the baby isn´t really going to be a 
"freak". I can understand that if this go on for generations it could perhaps be 
a problem because of the recessive genes. My question is really if inbresthing  
is a sufficient cause to "bad" genes (I mean it ought to be almost as many 
"good" genes, plus the recessive genes dosn´t make there concrete appearence 
before many generations or?) ?
Happy easter! (excuse my bad english).

Re: How many generations of inbreathing can a few-inhabitant 'tribe' cope whith