"as I recall the spider gene is a dominant gene, which would mean that only the spider offspring should or would have the wobble since it would be the only offspring that would have the spider genetics (normals would not carry any of the spider gene, hence no wobble)."


I am pretty sure that when BP's are bred that more than just the alleles for the color/pattern are being handed down to the offspring. All genes are passed on. Just because the color/pattern gene wasn’t passed doesn’t mean that a bad/deformed gene wasn't.

Just food for thought. Its more than just the dominant/recessive "visual" genes that we as breeders are dealing with.