  Biological genomes are divided into coding and non-coding regions. Introns
are non-coding parts within genes, while the remaining non-coding parts are
intergenic sequences. To study the evolutionary significance of recombination
inside introns we have used two models based on the Monte Carlo method. In our
computer simulations we have implemented the internal structure of genes by
declaring the probability of recombination between exons. One situation when
inside-intron recombination is advantageous is recovering functional genes by
combining proper exons dispersed in the genetic pool of the population after a
long period without selection for the function of the gene. Populations have to
pass through the bottleneck, then. These events are rather rare and we have
expected that there should be other phenomena giving profits from the
inside-intron recombination. In fact we have found that inside-intron
recombination is advantageous only in the case when after recombination,
besides the recombinant forms, parental haplotypes are available and selection
is set already on gametes.
