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Resistance of rib1 homozygotes and heterozygotes to 2,4-D. Root length distribution of seedlings grown on 6 × 10−8 M 2,4-D for 7 d. A population of F1 seedlings from a No-0 X rib1 cross (bottom) is compared with No-0 and rib1 homozygous populations (top). Statistical analyses (t test) indicate that rib1 is not recessive (P = 4.5 × 10−5).
