Simple bit-string model for lineage branching.
Phys Rev E Stat Nonlin Soft Matter Phys
; 70(5 Pt 1): 051910, 2004 Nov.
Article
en En
| MEDLINE
| ID: mdl-15600659
ABSTRACT
We introduce a population dynamics model, where individual genomes are represented by bit strings. Selection is described by death probabilities which depend on these genomes, and new individuals continuously replace the ones that die, keeping the population constant. An offspring has the same genome as its (randomly chosen) parent, except for a small amount of (also random) mutations. Chance may thus generate a newborn with a genome that is better than that of its parent, and the newborn will have a smaller death probability. When this happens, this individual is a would-be founder of a new lineage. A new lineage is considered created if the number of its live descendants grows above a certain previously defined threshold. The time evolution of populations evolving under these rules is followed by computer simulations and the probability densities of lineage duration and size, among others, are computed. These densities show a scale-free behavior, in accordance with some conjectures in paleoevolution, and suggesting a simple mechanism as explanation for the ubiquity of these power laws.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Dinámica Poblacional
/
Mapeo Cromosómico
/
Análisis de Secuencia de ADN
/
Evolución Biológica
/
Genética de Población
/
Modelos Genéticos
Límite:
Animals
/
Humans
Idioma:
En
Revista:
Phys Rev E Stat Nonlin Soft Matter Phys
Asunto de la revista:
BIOFISICA
/
FISIOLOGIA
Año:
2004
Tipo del documento:
Article
País de afiliación:
Francia