Polyploidy is very common in plants, especially in angiosperms.
In fact, the chromosome content of most plants groups suggests that the basic angiosperm genome consists of the genes on 7-11 chromosomes. This has led to the deliberate creation of polyploid varieties of such plants as watermelons, marigolds, and snapdragons. Origin of Polyploidy Polyploidy has occurred often in the evolution of plants. These can arise in at least two ways. The gametes may be formed by mitosis instead of meiosis .