Xi Wang wrote:
Ploidy refers to how many sets of chromosomes a cell nucleus contains.
Usually, every cell has two copies of a chromosome, and is designated
2N. Usually, higher ploidy number means more robust plant (sequoiae are
6N and are huge trees, and some of the most robust)- if some genes get
damaged, they have more backup genes to work with. However, a 3N plant
can only produce progeny with a 3N plant, and 4N plants, preferably with
other 4N plants.


3N plants (triploids) are notoriously infertile. Regardless of what you
cross them with. Even ploidy (2,4... etc) are more fertile because they
can properly pair off chromosomes during meiosis.

Rob


--
Rob's Rules: http://littlefrogfarm.com
1) There is always room for one more orchid
2) There is always room for two more orchids
2a) See rule 1
3) When one has insufficient credit to obtain more
orchids, obtain more credit