1. The Argentine varieties of commercial corn are all flint and can be classified in three groups according to endosperm color:
|a. Varieties with||orange endosperm.|
Genetical analysis shows that both groups a and b carry the genes Y1Y1Y3Y3. In the first group the varieties Colorado Cuarenton were tested; in the second group the varieties Amarillo Comun and Amarillo Enans. The difference in color between groups a and b is due to modifying factors. Long White Flint, the only variety of white endosperm tested, has the genotype y1y1Y3Y3.