intensifier intensifier of anthocyanins: Two homozygous colored pr1 ears; the red one on left is heterozygous (In1/in1) and the almost black one on the right is homozygous in1.

intensifier intensifier of anthocyanin and related brown pigments: Selfed homozygous a1 Pr1 in1 wx1 , Dt3/+, R1/r1 ear showing various levels brown pigment due to doses of R1 in the 3N endosperm. The a1 alternative to A1 anthocyanin (brown pigment) is enhanced by in1 but it has no visible affect on the null expression of r1.

intensifier multi-gene interaction: Selfed ear segregating for multiple aleurone and endosperm genes: pr1 (red/purple), R1 (solid anthocyanin/mottled/colorless), su1 (sugary/normal), y1 (white/yellow endosperm), sh1 (shrunken/normal kernel), and wx1 (waxy/normal), in an intense, in1, purple popcorn background. A demonstration of gene dosage, gene interaction, independent assortment, and linkage; phenotypes of seven genes clearly displayed, all on one ear!