  Using Monte Carlo methods, we simulated the effects of bias in generation and
elimination of paralogs on the size distribution of paralog groups. It was
found that the function describing the decay of the number of paralog groups
with their size depends on the ratio between the probability of duplications of
genes and their deletions, which corresponds to different selection pressures
on the genome size. Slightly different slopes of curves describing the decay of
the number of paralog groups with their size were also observed when the
threshold of homology between paralogous sequences was changed.
