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Minnesota(dw447@fastmail.fm)

What are some of the reasons for using crossbacks in a breeding strategy? Or is it simply to produce seeds that have genetics that are three-fourths one parent, and one-fourth the other?
Are the following all examples of crossbacks?:
(a X b) X a
(a X b) X b
a X (a X b)

11/28/2005 1:50:04 PM

Syracuse, NY

i would assume that the term crossback would indicate
that you would be CROSSing something BACK into a pairing that has already occurred, USING one of the original parent seeds again. so, i THINK that the first two are crossbacks but not the third one. there may be another term for that.
i am no expert, but just discussing it has made me drool, lol! eric.....experts take the stage, please.
so, my 508 Gerry '02
(300 Gerry '01 (1140 X 845))....X 845........is a crossback.

11/29/2005 1:51:57 AM

Ctpumpkin@optonline.net

I'm no genetic expert but the first & third are the same crosses writtenly differently.

These are all cross backs as far as I know. And I believe the intent is to obtain more of a good thing that one hopes will be expressed when one parent has demonstrated more desirable traits than the other.

The theorum assumes that the initial axb cross was grown out & a desired trait was seen in the fruit that the (a X b) X a came from.

11/29/2005 5:12:28 AM

Rhode Island

hummmmmmmmm a crossed with a @ b ?
sounds a lot like alma and burt with alma helping herself along a little.
this is not a crossback but more of a reach around.
is it april yet ?

11/29/2005 8:04:07 AM

Pocatello (cliffwarren@yahoo.com)

This is exactly the way that Nic Welty was describing his
plans for doing this, or creating "F1" crosses (inbred
crosses). It's sort-of like selfing... After this has
been done, then cross seemingly unrelated lines to get an F2.
It's on a tape of the Niagra seminar from a few years ago.

11/29/2005 10:26:44 AM

Syracuse, NY

pap--reach around---LOL!

12/2/2005 2:12:29 AM

Cologne / Germany

I like this one as it sounds like a real strategy:

1.) 842 Eaton = 846 Calais x 723 Bobier
2.) 1301 Eaton = 842 Eaton x 1236 Eaton (reverse of 842)
3.) 1446 Eaton = 842 Eaton x 1301 Eaton

in other words:

1.) c = a x b
2.) d = c x (b x a)
3.) e = c x d

I think there are lots of proven seeds around to make crosses like this.

12/2/2005 7:17:43 AM

Minnesota(dw447@fastmail.fm)

Thanks for the replies.
Some crossbacks(or very near crossbacks) that have done quite well are:
500 Beauchemin
763 Biss
664.5 Liggett
869.5 Calai
Great genetics behind these seeds.

12/3/2005 11:24:43 PM