In an effort to develop a C-I C-I En En stock, it was necessary to testcross putative C-I C-I plants to C C in order to verify this genotype. Though C-I to C changes are often observed by anyone working with the C-I allele, one particular plant (793450-5) showed an excess frequency of colored spots when tested on C C. Subsequent tests of the C-I allele (C-I Sh Bz Wx) with C sh bz wx as a tester show

that the loss can include C-I alone or C-I and Bz. Each time Bz is lost, the tester wx phenotype is simultaneously uncovered. These appear as single loss rather than BBF type events.

Peter A. Peterson

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