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. 2015 Feb 2;5(4):541–549. doi: 10.1534/g3.114.015263

Figure 1.

Figure 1

Schematic of the selection protocol utilized to advance the Wisconsin Quality Synthetic (WQS) population. A second generation (S2) topcross selection method is utilized to improve this germplasm. Inbreds derived from succeeding cycles of improvement are developed and released. Population improvement and inbred development occur simultaneously. The red oval highlights the approximately the 20 S2 families that originate each subsequent cycle of selection.