Its possible for a normal out of a spider breeding to display head wobble or tremors.
I have seen it in crosses made with spiders, all spiders display this behavior at some time or another. it can not be bred out of spiders.
I'd like additional clarification on this statement.
You say it's possible for
normals produced from a spider parent to display the wobble.
Then you say you've seen it in crosses made with spiders. Are you talking about something like bumblebees here, which also display the spider mutation?
Have you personally produced an
normal patterned snake from a spider breeding that displays the classic head wobble of the spiders?
If you have then you would be the first who claims to have first hand experience of normal spider sibs with the wobble and I would very much like to see that animal.
To date anything I've ever seen or read about this issue has been what someone "heard". As I said, so far there are
no substantiated cases of a normal spider sibling displaying the wobble. If you can actually prove that you have seen this then I would be interested in seeing that proof.
Considering the sheer number of breedings from spiders and the to date complete lack of normals form those breedings displaying the wobble, I remain very skeptical.
As for your statement that
all spiders display the condition at some time or another, that is just plain wrong. There are many spiders which are known to have never displayed the condition.
I do agree however that it cannot be bred out of the mutation, since spiders known to have never wobbled have also been known to produce offspring that did.