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Genome composition of F2 hybrids of A. cepa × A. roylei and genome composition of the male gametes (pollen grains) calculated from the genome composition of BC1 progeny of A. cepa × (A. cepa × A. roylei). Number of parental chromosomes is based on the origin of the centromere region of a particular chromosome. A dashed line in a violin plot represents median and dotted lines represent quartiles.
