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Meiosis without (A) or with crossing over (B). Left panel shows pollen mother cells and right panel, tetrads after meiosis. Chromosome 2 carrying the wild-type AUR2 (A) is shown in a blue line or the aur2-1 allele (a) with a translocation is indicated in a bold red line. M I, meiosis I; M II, meiosis II; shaded cells, aborted pollen grains.
