AR: Chromosome Segregation
- To: Iris Talk Listserver <i*@onelist.com>
- Subject: AR: Chromosome Segregation
- From: S* M* <7*@compuserve.com>
- Date: Thu, 20 Aug 1998 14:07:45 -0400
- Content-Disposition: inline
From: Sharon McAllister <73372.1745@compuserve.com>
Celia Storey wrote:
> Remember the pollen offer (spring '97) in which you sent many of us some
AB
> pollen? And I crossed mine to a few TBs, of which only one, STOP THE
MUSIC,
> set a pod. And there were 34 seeds in that pod, which I direct-planted
in
> July '97 into my Little Rock garden, in rather sandy fertile soil on the
> side of a gentle slope.
> All told, 14 sprouted. I have 11 healthy babies left after our wet
winter
> and drought-like summer.
<snip>
> From the foliage behavior alone, can I
> make judgments about which seedlings bear the most aril genes?
Sometimes. Oversimplifying again, most crosses that produce arilbreds can
be placed in one of two groups:
1. Crosses between two fertile families. The resultant siblings will
be relatively uniform and of a single, predictable karotype. In plain
English -- they have the same number of aril genes. The variation is in
the expression of those genes.
2. Crosses between a member of one fertile family and a compatible
hybrid of limited fertility. The resultant seedlings will be quite
diverse, but will segregate into the two parental karotypes. One type will
have more aril genes than the other, and the foliage and growth habits may
indeed be useful indicators of which group a given seedling belongs to.
Most of the pollen I sent out in the spring of '97 came from halfbreds,
because this was an experiment designed for beginners. That means a cross
of the first time, between members of two different fertile families --
which means you have a set of quarterbreds. The # of seeds in the pod and
the number of surviving seedlings you report support that assessment. [If
you can tell me the name or seedling number of the pollen parent, I can
give you a more definitive answer.]
Sharon McAllister
73372.1745@compuserve.clm
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