Amphidiploidy in plants

    A cross between two separate species,  radish (Raphanus) and cabbage (Brassica), both with 2n = 18, allows the two n = 9 gametes to produce a sterile 2n = 18 amphidiploid hybrid. Polyploidization of this hybrid produces a fertile tetraploid plant, the "rabbage" (Raphanobrassica) (4n = 36). The rabbage unfortunately combines the leaves of the radish and the root of the cabbage,  rather than the edible leaves and roots!

Figure ©2002 by Griffiths et al.; all text material ©2008 by Steven M. Carr