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K. Mccourt keith at UTCC.UTORONTO.CA
Sat Sep 18 16:36:23 EST 1993

	We have observed unusual dominance/recessive relationships 
with severe alleles of abi3, which pleiotropically affect Arabidopsis 
seed development.  For a given abi3 allele, some phenotypes are 
dominant to wild-type while other phenotypes are recessive to the 
same wild-type allele.  Dominance is therefore a property of the 
phenotype rather than a property of the allele.  It is very difficult to 
see how this situation can be clearly represented with allele symbols, 
because the dominance relationship is not a property of the allele, but 
of the way dominance is assessed (i.e. how you analyze the phenotype).  
If this situation turns out to be a general case, using allele 
designators to indicate dominance could result in catastrophic 

	Has anyone else observed this sort of situation?  

Kallie Keith     keith at gpu.utcc.utoronto.ca 
Peter McCourt    peterm at gpu.utcc.utoronto.ca

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