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Publisher Summary This chapter presents the key trait differences between teosinte and corn in isogeneic backgrounds that enables to determine the minimum number of genetic changes that are essential to convert teosinte into corn, to determine the inheritance and chromosomal location of these genes, to determine the modifying effects of background genes in shaping the expression of the key trait genes, and to determine from the past and current direction of corn's evolution as to where it may be going from here and which loci and genes will be useful in directing the future extension of this evolution. Only four or five inherited key trait units separate teosinte from corn and is based on the recovery rate of parental types in F 2 segregations. One viewpoint holds that these inherited units are clusters of linked genes that eventually evolved their partial isolating mechanisms through tight linkage, cross-over suppressors—such as cryptic rearrangements—, and chromosome knobs or by close linkage with gametophyte genes. |
