Apparently I am not being clear as to what i am asking.

I know it is luck of the draw. I know that percentags say it will always be the same.

What I am trying to get to is when you have bred snake A to snake B how many were what you were looking for out of the pairing? So more statistics. That was why I worded my second question the way I did.

From breeding male spiders this many eggs were laid/hatched and this many were spiders.

From breeding femals spiders this many eggs were laid/hatched and this many were spiders.

That kind of thing.

I guess I should of worded it like this in the first place.

I hope that clears up what I am trying to get.