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HYB: 1/4 X TB Crosses


From: Sharon McAllister <73372.1745@compuserve.com>

Message text written by Dennis Kramb:

>
I had 6 successful crosses between quarterbreds and halfbreds.  Do you have
any comments about the comparative difficulty of achieving success with 1/4
& 1/2 versus 1/4 & TB. ??
<

How do you define success?

In theory, a quarterbred [ABBB-type by chromosome set notation] produces AB
and BB gametes in equal numbers.  If that sounds strange, just delve into
the archives for the "homework assignment" regarding the math.   In theory,
therefore, it should be equallly easy to get seeds from a 1/4 x 1/2 cross
as from a 1/4 x TB cross.  The former should produce 1/4-breds and
1/2-breds in equal numbers and the latter should produce 1/4-breds and TBs
in equal numbers.

I've found, however, that growing conditions make an enormous difference. 
I've had very little success in getting seeds from crosses of 1/4-breds
with TBs -- but that's the case with ANY cross involving TBs, whether the
other parent is aril, near-aril, 1/2-bred, 1/4-bred, or TB.  OTOH, 1/4-bred
x 1/2-bred crosses have produced many wondrous things.  Other hybridizers,
working in different climates, probably have considerably greater success
with 1/4-bred x TB crosses.

If your definition of "success" is new insight -- give priority to the type
of cross most productive of seedlings under your own growing conditions.

If you want something that can be easily registered as an arilbred, give
preference to the 1/4-bred x 1/2-bred crosses.

If you want to push the envelope and try for the type of cross-over that
can result in a fully fertile TB with some aril genes and aril
characteristics -- concentrate on the 1/4-bred x TB cross.  The odds are
against you, but if you should achieve such a breakthrough you will have
opened up a "whole, new world".

Sharon McAllister
73372.1745@compuserve.com

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