highly significantp < 2.2 × 10 –16
This difference in the proportion of homologous genes between preferentially sporophyte expressed and all expressed genes was highly significant in both species according to a chi-squared test ( P. patens : χ 2 df = 1 = 206.16, p < 2.2 × 10 –16 ; F. hygrometrica : χ 2 df = 1 = 384.73, p < 2.2 × 10 –16 ).