Abstract
THE common oat, Arena sativa, is a hexaploid (2n=6x=42) whose chromosomes form exclusively bivalents during meiosis. The bivalents are formed by the pairing of exact homologues resulting in disomic inheritance. Gene duplications and triplications were revealed by early inheritance studies1 and homoeologous relationships of the three genomes were later supported by the good tolerance of deficiency for single and for pairs of chromosomes2.
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