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
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!
by Griffiths et al.; all text
©2008 by Steven M. Carr