Abstract
Maize occupies dual roles as both (a) one of the big-three grain species (along with rice and wheat) responsible for providing more than half of the calories consumed around the world, and (b) a model system for plant genetics and cytogenetics dating back to the origin of the field of genetics in the early twentieth century. The long history of genetic investigation in this species combined with modern genomic and quantitative genetic data has provided particular insight into the characteristics of genes linked to phenotypes and how these genes differ from many other sequences in plant genomes that are not easily distinguishable based on molecular data alone. These recent results suggest that the number of genes in plants that make significant contributions to phenotype may be lower than the number of genes defined by current molecular criteria, and also indicate that syntenic conservation has been underemphasized as a marker for gene function.
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