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GKA model crossing scheme. The crossing scheme shows the Xiphophorus species used to produce F1 and BC1 interspecies hybrids. X. maculatus Jp163 A and X. hellerii are used to produce F1 hybrids artificially. The F1 hybrids are subsequently backcrossed to X. hellerii to produce BC hybrid progeny. BC hybrids exhibiting melanocyte hyperplasia and heterozygous R(Diff) are used as parents for next-generation BC.
