Supplementary material 1 from: Iqbal MZ, Cheng M, Zhao Y, Wen X, Zhang P, Zhang L, Ali A, Rong T, Tang QL (2018) Mysterious meiotic behavior of autopolyploid and allopolyploid maize. Comparative Cytogenetics 12(2): 247-265. https://doi.org/10.3897/CompCytogen.v12i2.24907