Pinstripe to pinstripe has a 25% chance of producing a homozygous pinstripe that would in turn produce only pinstripes when bred to a normal. BUT, this homozygous pinstripe would not look any different from a heterozygous pinstripe. Because of this I don't know anyone who breeds a pin to a pin. If they look the same there is no benefit unless you are going to keep every offspring and breed it to find out if it is a homozygous pinstripe.
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