Spector and YB are allelic and in the same gene complex. Meaning the homozygous form "super stripe" when bred to a normal would yield either spectors or ybs and no normals and no superstripes. Much as a ivory to normal would make all ybs and no ivory, only difference is in this case you are substituting a YB gene for a Spector gene. It works with way with all the complex mutations from blue eye lucy, black eye Lucy, black pastel complex and YB complex.
So to make a pastel super stipe you need to cross Spector and yb together in the same pairing, with either of which having pastel as well. Hopefully this makes sense.
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