Polyploid (in Greek: πολλαπλόν - multiple) cells or organisms contain more than one copy (ploidy) of their chromosomes. Polyploidy occurs in animals but is especially common among flowering plants, including both wild and cultivated species. Wheat, for example, after millennia of hybridization and modification by humans, has strains that are diploid (two sets of chromosomes), tetraploid (four sets of chromosomes) with the common name of durum or macaroni wheat, and hexaploid (six sets of chromosomes) with the common name of bread wheat.
Polyploidy can be induced in cell culture by some chemicals: the best known is colchicine, which causes chromosome doubling.
Triploids are frequently produced by suppressing the second meiotic division - cell division involved in producing germ cells - using shock treatments, such as heat, cold or pressure.
Sterile triploids have been suggested as a means to contain transgenes in transgenic stocks released to the natural environment, as if the method were "fool proof".
Ocean migration and recoveries of triploid Atlantic salmon were between 12% and 24% of diploid siblings.
Promise Triploid Watermelon seed is a hybrid, triploid watermelon that is a Sweet Eat'n type melon with larger size.
WT-04-51 Triploid Watermelon seed is a hybrid, triploid watermelon with early maturity and features a tiger striped rind pattern.
This triploid watermelon is oblong or oval shaped weighing in at 20-25 pounds with a faded Cal Sweet stripe and light green field with dark green, wide stripes.
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