Fig. 2.

The origin of barley neocentromeres as described by Nasuda et al. (4). The study began with a translocation between barley chromosome 7HS and an unidentified wheat chromosome. An isochromosome derivative of the translocation was identified that had lost the wheat half of the chromosome as well as any evidence of the barley centromere. From the isochromosome, two telosomic derivatives were produced that appeared to have lost even larger segments of the original centromere. The telosomes lacked known centromere repeats from either barley or wheat yet were mitotically and meiotically transmissible.