on how tightly linked the wobble gene is to the spider gene. It seems very tightly linked so the chance is very small that a normal could have the spider wobble. The only way it could happen is during a crossing over event that occurred between the spider gene and the wobble gene. This assumes that two genes are at play and are very tightly linked. It is also possible that the wobble defect is a result of the spider gene. If this is true then it is impossible for a normal to have the wobble, unless there is a new mutation that causes wobble in normals.
I suspect but cannot prove that the spider wobble is not actually two genes. I suspect the spider gene causes a defect in coloration and a defect in neuronal structure or function. If I am correct then the two traits cannot be separated.
David
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