I believe they are called Mojave Spider (I've seen it called a spimo, but that's not an official name or anything). And anything with the spider gene will come with a wobble to a degree, some completely not noticeable and some very noticeable. You will not get half and half. You will get:
1/4 wildtype (normal)
1/4 mojave
1/4 spider
1/4 spimo
That's a 1/4 chance per egg, not per clutch.
http://www.worldofballpythons.com/morphs/mojave-spider/
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