Spider to spider would give you 75% spiders and 25% normals. If spider genetics behaved like a classical dominant gene, theoretically 1/3 of the spiders produced in the clutch would be homozygous and therefore if they were bred to normals they would produce 100% spiders. However, I do not believe that spider genetics have been completely determined yet. In fact based on the fact that to my knowlege there have not been any spiders bred to date that will through 100% spider clutches, it seems likely that there is a different genetic phenomenon which explains the phenotypic expression for spider.
Grant

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