Following tetraploidy in maize, a short deletion mechanism removed genes preferentially from one of the two homologs.

The Under- and Over-Fractionated Maize Homeologs Are Equally Diverged from Their Sorghum Ortholog at the Level of Nearly Neutral Base Pair Substitution (Ks) Table 1 , Column O, reports our measured ratio of Ks [ Zm -under/ Sb ] to Ks [Zm-over/ Sb ] for a total of 1,772 Sb-Zm-Zm gene units in the five sorghum homeologous regions for which highly significant under/over-fractionation expectations existed ( Table 1 ).

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