Abstract
It has been found that, in the intercross pdxp x pdx, pdx and pdxp appear to become wild with a frequency of about 0.2%. In the crosses pdx x pdx and pdxp x pdxp, on the other hand, they either do not become wild or do so much less frequently. From the results reported here it appears that pdx becomes wild, or is "converted" to wild, in + x pdx and that this is likely to be true of pdxp also, although the change has not been observed in tetrads. It also appears that the near-by mutant arg either does not become wild in + x arg or does so with a much lower frequency than pdx.

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