The Cy content of various lines was assayed by crosses with bz-rcy. If the line to be tested was Bz/Bz, as most are, the F1 was backcrossed to bz-rcy. The appearance of colored spots on a bronze background indicates the presence of one or more genetically active Cy elements in the stock. The data are shown in Table 1. Due to the small sample size for many of the tests it is not possible to state that particular stocks lack genetically active Cy elements. However, Cy is clearly not widely distributed in stocks unrelated to the population from which bz-rcy arose. The exception is lines derived from Mutator stocks which in some cases have many independently segregating genetically active Cy elements present.
Patrick S. Schnable and Peter A. Peterson
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