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Metaphase in a hybrid zygote 24 h after pollination of wheat (Triticum aestivum ‘Chinese Spring’, 2n = 42) with maize (Zea mays ‘Seneca 60’, 2n = 20). Solid arrows point to the ten maize chromosomes. The remaining larger 21 chromosomes come from wheat (open arrows indicate the wheat satellites; from Laurie and Bennett, 1988). Scale bar = 10 µm.
