Various species of the flowering plant Chrysanthemum have 18, 36, 54, 72, and 90 chromosomes. The variation is likely due to:

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The variation in the number of chromosomes in Chrysanthemum species is likely due to polyploidy, which occurs when an organism has multiple sets of chromosomes. This can occur through hybridization events or errors during cell division, and can result in an increase in the number of chromosomes in an individual.

Various Species of the Flowering Plant Chrysanthemum Have 18, 36