Fig. 6: Relative allelic expression (RAE) in hybrids and polyploids with respect to parental expression divergence.
A Simulation results under reference scenario 1, i.e., assuming single specific site per chromosome and negligible concentration of free TFs. B Simulation results under the combination of scenarios 3 & 5, i.e. assuming single specific site per chromosome, significant concentration of TFs in a free state and asymmetric cell volumes with the parental A twice as large as the parental B. C Simulation results under the combination of scenarios 3 & 5 assuming single specific site per chromosome, negligible concentration of free TFs and asymmetric cell volumes with the parental A twice as large as the parental B. D Simulation results under the combination of scenarios 3 & 6.a, i.e. assuming single specific site per chromosome, negligible concentration of free TFs and 10 times higher euchromatic ratio in species B with adaptation through modification of binding sites. E Simulation results under the combination of scenarios 3 & 6.b, i.e. assuming single specific site per chromosome, negligible concentration of free TFs and 10 times higher euchromatic ratio in species B with adaptation through modification of TF molecules. X-axis demonstrates the expression divergence between parental species in terms of their fractional occupancies \({\log }_{2}({f}_{{{\rm{A}}}}/{f}_{{{\rm{B}}}})\), \(y\)-axis indicates the relative allelic ratios \({\log }_{2}({f}_{{{\rm{H}}}}^{{{\rm{A}}}}/{f}_{{{\rm{H}}}}^{{{\rm{B}}}})\) of orthologous (parental) alleles Ahyb and Bhyb in a hybrid, normalized by their genomic dosage (note that A-derived binding sites have twice higher absolute numbers in AA species than in AB hybrid and identical to AAB triploid). Line colours and styles correspond to the types of individuals and strength of cross regulation analogously to Fig.3.
