Fig. 1. A frequency distribution of an F₂ soybean population from the cross OT89-5 x OT94-47 segregating for days to first flower under a 20-h photoperiod produced by incandescent lamps. The parents flowered in 43.2 (OT94-47) and 57.3 d (OT89-5) and are shown as mean ± 2 S.E.

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