HYB: Getting It Straight For the Simple Minded - RePost

[I sent this at about 12:30 this afternoon (OK, OK, 12:34PM) and did not see
it show up on the list, so I am posting it again. Apologies for any double
posting.]

I think this should go under this topic.

Now, I've seen on this list that there are varieties of iris that are called
tetraploid when referring to their genetic make-up. This means that instead
of having the one normal set of chromosomes, they have two sets. This,
apparently, increases the varietal possibilities from those iris so far as
bloom, color, growth, etc. are concerned, looking for some sort of "ideal"
combination. Is this correct so far?

When dealing with tetraploids, there may be some fertility issues between
various varieties, but, for the most part, one is fertile with another.
Correct?

A question about the tetraploid state. Was this caused by chemical means, of
which I recall some talk of here, or was this a natural happenstance when
crossing between varieties or species?

Arilbred iris are crosses with various bearded iris and aril iris. For the
most part, these crosses are fertile. Did this cross give more than the
normal number of chromosomes?

I think that is enough for a start. Mayhap it covers a bit too much
territory. Looking forward to the answers, well, maybe better said as
waiting for the replies <g>.

Thanks.

 \\Steve//

You know you've found that special someone
When they say those three little words:
"drinks on me".

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