Divergent evolution paths of different genetic families in the Penna model

Biology – Quantitative Biology – Populations and Evolution

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Scientific paper

10.1142/S0129183105008436

We present some results of simulations of population growth and evolution, using the standard asexual Penna model, with individuals characterized by a string of bits representing a genome containing some possible mutations. After about 20000 simulation steps, when only a few genetic families are still present from among rich variety of families at the beginning of the simulation game, strong peaks in mutation distribution functions are observed. This known effect is due to evolution rules with hereditary mechanism. The birth and death balance in the simulation game also leads to elimination of families specified by different genomes. Number of families $G(t)$ versus time $t$ follow the power law, $G \propto t^n$. Our results show the power coefficient exponent $n$ is changing as the time goes. Starting from about --1, smoothly achieves about --2 after hundreds of steps, and finally has semi-smooth transition to 0, when only one family exists in the environment. This is in contrast with constant $n$ about --1 as found, for example, in \cite{bib:evolution}. We suspect that this discrepancy may be due to two different time scales in simulations - initial stages follow the $n\approx-1$ law, yet for large number of simulation steps we get $n\approx-2$, providing random initial population was sufficiently big to allow for still reliable statistical analysis. The $n\approx-1$ evolution stage seems to be associated with the Verhulst mechanism of population elimination due to the limited environmental capacity - when the standard evolution rules were modified, we observed a plateau ($n=0$) in the power law in short time scale, again followed by $n\approx -2$ law for longer times. The modified model uses birth rate controlled by the current population instead of the standard Verhulst death factor.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Divergent evolution paths of different genetic families in the Penna model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Divergent evolution paths of different genetic families in the Penna model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Divergent evolution paths of different genetic families in the Penna model will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-588430

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.