300905 Study Guide - Final Guide: Frequency-Dependent Selection, Fitness Landscape, Genetic Drift
Document Summary
An adaptive landscape is a hypothetical topological landscape upon which evolution is envisioned to take place. Wright"s fitness landscaping in which the location of each point represents the genotype of an organism and the altitude represents the fitness of that organism in the current environment. However, unlike wright"s rigid landscape, the adaptive landscape is pliable. It readily changes shape with changes in population densities and survival/reproductive strategies used within and among the various species. This theory, based on the assumption of density-dependent selection as the principal forms of selection, results in a fitness landscape that is relatively rigid. A rigid landscape is one that does not change in response to even large changes in the position and composition of strategies along the landscape. As such, the shape of the adaptive landscape can change drastically in response to even small changes in strategies and densities.