Subclones of [<i>PSI</i>⁺ref] develop divergent transmission properties without selection.

Twelve subclones of 779-6A were grown for >75 generations and single clones were then amplified and used as cytoduction donors to the three polymorphs. Bold figures are transmissions between polymorphs that are more efficient than when the donor was the parent strain 779-6A (top three lines). The p values shown are the probability that the results observed would be obtained by chance if there were in fact no difference between the indicated cytoduction from the subclone and the corresponding cytoduction from the parent strain. The p values are calculated as described in Methods and indicate the probability that the difference between the indicated result with Yx as donor and that with the parent strain 779-6a as donor is due to chance. Transmission types are listed in the text.