4 Genetic Demixing in Bacterial Colonies
The evolution of natural populations involves more than mutations followed by natural selection—the reshuffling of genes during genetic recombination, stochasticity, and spatial migrations are also important. The effects of fluctuations and spatial structure become especially pronounced when organisms spread to new territories because the number of organisms at the front of the expansion is typically small. The interplay of number fluctuations and migration causes spatial genetic demixing, i.e., spatial segregation of different genotypes. We formulated a simple phenomenological model that describes genetic demixing, and tested its predictions in bacterial colonies growing on the surface of a Petri dish. In addition, we developed a set of experimental methods to estimate important biological parameters of microbial colonies (migration rates, selective advantage, and effective population size responsible for the fluctuations). These methods could be useful for future studies of evolutionary dynamics in populations with spatial structure. More importantly, genetic demixing affects many evolutionary processes. In particular, we showed that mutualism between two species can evolve only when it is sufficiently strong and fair, i.e., both species benefit equally.
It looks like no one has posted a comment yet. You can be the first!
Category: Education | Updated over 2 years ago
- May 20, 2011 13:05
- All Rights Reserved (What is this?)
- Additional Files
- 11568 times
Added over 3 years ago | 00:28:28 | 8448 views
Added over 2 years ago | 02:17:11 | 1513 views
Added over 3 years ago | 00:23:09 | 11918 views
Added over 3 years ago | 00:11:47 | 3440 views
Added over 3 years ago | 00:22:00 | 8278 views
Added over 3 years ago | 00:33:04 | 11575 views