Change in plaque diameter along experimental virus phylogeny.
Numbers represent change along each branch.
Significance of this value was calculated by comparing the mean value of the descendent to the mean value of ancestor plaques with a t-test. Actual values are proportional black circles to and theoretically reconstructed values are white circles. Including wild type as an outgroup on a branch the same distance from the root as other taxa. Results of computer simulation where characters were simulated along a symmetric phylogeny with 7 terminal taxa. Three models of character evolution were used, one with no directional bias in character evolution, the others with different amounts of bias.