Fig. 6From: Homoeolog expression bias and expression level dominance (ELD) in four tissues of natural allotetraploid Brassica napusThe explanations for ELD-A or ELD-C. If the allotetraploid B. napus (AC) maintains the progenitor’s expression pattern, its expression pattern should be additive (red text). The expression level of AC was higher than (A + C)/2, which could be explained by the upregulation of at least one homolog from progenitor A or C (a & c). Moreover, the expression level of AC was lower than (A + C)/2, which could be explained by the downregulation of at least one homolog from progenitor A or C (b & d)Back to article page