AG Seed Color Gene

Thanks to Al Eaton and others who supplied the seed color of some of the
fruits that I asked about. That pedigree did not show the inheritance of
AG seed color. 
  Then Sott Armstrong sent a very short pedigree which suggests the
inheritance. We must now seek more data to confirm the hypothesis.
Here is what Al Eaton and others gave us re: Armstong's data. 
1. All the mature seeds in an AG fruit are the same color
2. White seeded fruits have had tan seeded childern.
3. Tan seeded fruits have had white seeded childern.
--- discussion ---
Normally the genetics of the female determines seed coat color because
the seed coat is maternal tissue. Since all the seeds in an AG fruit are
the same color, AG follows this pattern in beans and most (all?) dicots.
The AG seed coat is maternal tissue and the pollen has no effect during
the year of pollination, but affects the genetics of his daughter.

Scott Armstrong supplied the following short pedigree (some seed colors
supplied by Al Eaton):

female 567.5 Mombert 1992 (white seed) x male 804 Zehr 1994 (tan seed)
--> 750 Mombert 19?? (white seed) --selfed--> 301 Armstrong 1999 (tan
seed)

Color is commonly dominant because one good enzyme is enough to produce
color; let us suppose tan is T and white is t (recessive). This
hypothesis fits the Armstrong data. We will need more data for proof. We
welcome more pedigrees. Testcrosses are always the best data. 

In the above, 567.5 Mombert may be homozygous white (tt) and got a T
sperm from 804 Zehr so that the seed planted by armstrong was (Tt) [but
the seed was white because the tissues of 567.5 Mombert were (tt)]. 

If all this is true, then the seeds of 301 Armstrong 1999 have the
genotypes:  1/4 TT : 1/2 Tt : 1/4 tt.

Some people have sent me some very long e-mails containing data which
they hoped would shed light on the question of what roles sibbing,
selfing, and crossing should play in developing AG germlines. They felt
such long letters would not be welcome on Pumpkins@mallorn.com. 
  I think they are right. It is raw data which might some day provide
lessons, but not yet. Sill, I think some of it is interesting enough
that others would profit from it. I suggest the following:
  Last summer, I began a genetics mail list for K-12 kids, gardeners,
etc, but it has had fewer than one e-mail per month. I propose that
anyone who wants to sent bulky data to me, sent it to me or to that list
genetics@onelist.com . That archive is public, but you must join to send
messages (anti-spam measure). 
  To join or read the archive use http://www.onelist.com 
  By Monday, I suspect we will have four or more serious AG breeders
working on data there. It has a 5 MB website where you can upload data,
diagrams, tables, pictures, anything. There will never be any compliants
about the size of your data files or its boring nature at
genetics@onelist.com 
  I will continue to post short messages about genetics on
Pumpkins@mallorn. My excessively long lessons (like this one) will be
confined to genetics@onelist.com  

-- 
Harold Eddleman Ph.D. Microbiologist.       i*@disknet.com 
Location: Palmyra IN USA; 36 kilometers west of Louisville, Kentucky
http://www.disknet.com/indiana_biolab
g*@onelist.com <== your AG genetics data welcome.



---------------------------------------------------------------------
To sign-off this list, send email to majordomo@mallorn.com with the
message text UNSUBSCRIBE PUMPKINS
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index