A single autosomal gene for greenish yellow eyes, ye (Hasty & Payne, 1999) was combined with a single autosomal gene for yellow scales, y in the absence of yes which controlled color of both eyes and scales (Brown et al., 2001). Independent assortment of ye from y was observed in a test cross. SNPs (single nucleotide polymorphisms) were discovered in CYP6B10, hscp (heliothis sodium channel protein)), JHE (juvenile hormone esterase) and Cry1A toxin receptor genes in a backcross family. Size differences of PCR products were also observed in CYP9 and ryanodine receptor genes in a backcross family. The genetic linkage of CYP6B10 and hscp was found in backcross families (Park & Brown, 2002). The sex linkage of JHE gene was discovered in two backcross families.