Figure 3 .

A scheme of the crosses performed in a uniform W22 background, resulting in the tagging of o7 by the Ds element. After generating heterozygous seeds for mR^nj and segregating away the R-st allele, spotted normal kernels were planted in the final cross to generate the females to be pollinated by males originating from o7 homozygous kernels. More than 900,000 kernels from this final cross were screened for opaqueness.