extremely significantp < 0.01
A chi-square test of independence χ 2 − t e s t indicated that the frequencies of the three superior haplotypes showed a significant upward trend from wild soybeans to improved cultivars, with significant or extremely significant differences in distribution among populations P r o 2 : χ 2 = 10.8762 , p < 0.01 ; C D S 1 : χ 2 = 16.8923 , p < 0.001 ; H a p 1 : χ 2 = 14.9524 , p < 0.001 .