| Abstract
| - The mobility of members of a species, which may be modelled by diffusion, plays an important role in biology, though much remains to be discovered concerning its effects. It is therefore relevant to ask how diffusion itself may evolve, in particular in a spatially homogeneous environment. The authors suggest that one mechanism driving the evolution of a higher diffusion rate is connected with the effect of a deleterious recessive gene which appears in the population. A reaction-diffusion model is proposed, and numerical and theoretical results are presented which support the above hypothesis.
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