...Jeromine Vigneau; Claudia Martinho; Olivier Godfroy; Min Zheng; Fabian B. Haas; Michael Borg; Susana M. Coelho ABSTRACT In many animals and flowering plants, sex determination occurs in the diploid phase of the life cycle with XX/XY or ZW/ZZ sex chromosomes. However, in early diverging plants...

...Imrul Faisal; Liisa Kauppi In meiosis, non-exchange homologous chromosomes are at risk for mis-segregation and should be monitored by the spindle assembly checkpoint (SAC) to avoid formation of aneuploid gametes. Sex chromosome mis-segregation is particularly common and can lead to sterility...

... with the blistered form of abortive embryo. Two possible modes of origin for the balanced lethal system are discussed, either from ancestral autosomes or from sex chromosomes. The latter is favoured because it involves fewer assumptions. The subsequent evolution of the system should inevitably lead to progressively...