Isn't this wrong?

[Jessicat]

In reality, it depends on the genetics of the animals. Like someone mentioned, it can bring out desirable and undesirable traits but that depends on what the animal carries. It just depends on the line. Even mammals are line bred on a regular basis if you look at the lineage of purebred dogs, cats, and horses. It enhances certain traits and in some cases, makes you realize that there was an undesirable recessive trait there when you get offspring who express it. Also, remember that siblings are not 100% genetically similar so one may carry an undesirable gene while the other might not thus producing offspring who may carry it but won't show it.

Here's an example. Let's say you're trying to get albinos and we'll pretend ultramelanistic is an undesirable trait.
Genetic Wizard 3.0 calculations by

As you can see, these two could be siblings who were bred but because one didn't carry the negative gene, none of the offspring were affected. In this case, you wouldn't know that any negative gene was carried since you got all healthy offspring

In this example, both parents carry the undesirable trait and so you see it in the offspring telling you that the genetics are there. In this case, I wouldn't do the pairing again because you know that both parents are carriers. By bringing in outside blood in this case, you'd lower the risk.
Genetic Wizard 3.0 calculations by

That makes sense, thanks for that.

I had added the little story in my former post as I wasn't sure if the deformities of the snakes [missing eyes] were a result of line/inbreeding or something else? [and if it's something else, what could it be? o.O]

It's just that there are probably some out there who go for the minimal investment for the most profit, with all of them relating back to the first pair that was obtained, or possibly further back if the pair were related too.
So, ideally, if there are no bad effects from inbreeding what's stopping people from doing things like this? Would having a 6th generation line/inbred super-something really be possible with no issues as long as said "super-something" was a genetic morph or trait that was desirable? o.O I'm just a little sceptical that it can't be *that* easy, but if it can, well... ok *shrug* I'm wrong :B