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Mutation, Gene Flow, and Genetic Drift

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).

Genetic Variation

Genetic Variation

Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles,...

Genetics of Speciation

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.

Gene Flow

Gene Flow

Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.

Competition

Competition

When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.

Genetic Drift

Genetic Drift

Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations

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El papel de la competencia en la configuración de la variación genética críptica

C Hal Terry¹, Dante J Nesta¹, Lucia Caluseriu¹

¹Department of Biology, Indiana University Bloomington, Bloomington, Indiana, USA.

Evolution & development

|March 1, 2026

Resumen

Este resumen es generado por máquina.

La variación genética críptica en los renacuajos de spadefoot oriental (Scaphiopus holbrookii) es revelada por las dietas de camarones, pero solo bajo alta competencia. La competencia moderada suprimió esta variación, afectando la evolución potencial de los rasgos.

Palabras clave:

anfibio plasticidad del desarrollo acomodación genética novedad evolución impulsada por la plasticidad polifenismo renacuajo

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Área de la Ciencia:

Biología Evolutiva
Biología del Desarrollo
Ecología

Sus antecedentes:

La variación genética críptica, hereditaria pero no expresada, puede impulsar la novedad evolutiva.
Los entornos novedosos exponen la variación críptica, pero aún no está claro cómo interactúan múltiples entornos.

Objetivo del estudio:

Investigar cómo las interacciones ambientales modulan la variación genética críptica en poblaciones naturales.
Determinar si la variación genética críptica inducida por camarones en los renacuajos varía con la competencia de congéneres.

Principales métodos:

Se estudiaron renacuajos de spadefoot oriental (Scaphiopus holbrookii).
Se evaluó la variación genética críptica inducida por camarones en los rasgos de los renacuajos bajo diversos niveles de competencia intraespecífica.

Principales resultados:

La variación genética críptica inducida por camarones en el tamaño del cuerpo, la longitud del intestino y el área de la mandíbula ocurrió solo bajo alta competencia.
La baja competencia suprimió la variación hereditaria, lo que indica que el estrés moderado limita la expresión.
La variación en la profundidad de la cola del renacuajo no se vio afectada por la dieta o la competencia.

Conclusiones:

Los factores ambientales interactuantes (dieta y competencia) controlan conjuntamente la expresión de la variación genética críptica.
Esta modulación afecta el potencial de la variación críptica para impulsar la evolución de rasgos novedosos.