Re: IRIS-L digest 327
Kay Cangemi wrote:
: What is line breeding? It's a term I've heard hybridizer use, but I've
: never heard an explanation.
It just means crossing clones that are fairly closely related. It certainly
includes crosses to sibs, half-sibs & cousins and well as backcrosses to
ancestors. Many of usalso use the term for crosses to distant "cousins", as
long as we can identify the common ancestor(s). Line-breeding is especially
useful in working with recessive traits, because it's possible to develop a
"line" that has a high incidence of the desired genes.
To put this in perspective, the opposite is "out-crossing" -- the term for
crossing to a clone from a different line.
This may be done with a similar-in-appearance clone from a different line, in
order to broaden the gene pool, or with one from a completely different line to
bring in some new, desired trait.
Both have a place in any program. They are complementary, not contradictory.
But I think this is enough for "Lesson 1".
Thanks for asking. This is exactly the type of thing I had in mind when I
called for questions -- a term that we so take for granted that no one is likely
to define it unless someone brings it up.
Sharon McAllister (firstname.lastname@example.org)