Originally Posted by Early

Angelina Jolie x Brad Pitt= goodlooking offspring. (Hopefully)
1 Angelina x Brad x 1 Angelina x Brad= Lots of genetic variation. (F2)= 1 goodlooking one alot of average ones and one thats cockeyed.
The farther you keep going with this the more pronounced and varied it becomes. (F3)
1 that is amazing. Lots of weird ones. And one that is cockeyed and mentally disabled.
As long as you cull the ones that are not amazing I guess you will be okay. (selection)
The farther you inbreed any species the more pronounced the recessive genes will be.
I.E. smell and coloring. It can be a good thing sometimes. (Blueberry)
I hate to put it in terms of humans, but it is easier to understand that way.