It is possible that the homozygous spider genotype could be lethal and have heard this hypothesis previously. This could be the case, but I do not believe it has been proven. Equally likely is one of many other non-classical genetic explanations.
I have actually looked into the possibility of gene mapping and have some experience. I even went so far as to identify equipment etc. However, I would just say that it is not as easy as many think and takes considerable time even with the powerful DNA sequencing machines available today.

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