Adaptation to uncertain environments
Adaptation to Uncertain environments
Tangled Bank: Heterogeneous environment
The Tangled Bank holds that the state of the environment varies widely from place to place on a very local scale, such that different genotypes are optimal at different sites. Since each site can support only a few individuals, the uniform progeny of an asexual female will compete intensely with one another for the same set of resources, while the progeny of a sexual female, which by virtue of their diversity will be able to exploit a much wider range of sites, will compete amongst themselves less intensely and thus achieve greater overall success.
Sib-competition (Maynard Smith)
Density-dependent competition between siblings is wasteful from the point of view of the parent, and that this competition becomes more intense as siblings become genetically more similar.
It attributes the success of sexuality to the continual necessity to respond to the shifting challenge of antagonists such as predators and parasites.
Benefits of Recombination
Linkage between sites under selection will reduce the overall effectiveness of selection in finite populations.