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Frequency-dependent Selection01:21

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.Positive Frequency-Dependent SelectionIn positive...
Understanding Species and Reproductive Barriers01:17

Understanding Species and Reproductive Barriers

A species is a group of organisms that interbreed and produce fertile offspring. Typically, individuals of the same species appear similar and share common characteristics due to their highly similar genomes. However, not all organisms that look alike are members of the same species. Various mechanisms keep most species discrete. While some mechanisms prevent reproductive behavior and fertilization (pre-zygotic isolation), others prevent the production of fertile offspring after mating has...
Genetics of Speciation02:16

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...
Types of Selection01:46

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
Formation of Species01:31

Formation of Species

Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.Allopatric SpeciationIn allopatric speciation, gene flow between two populations of the same species is prevented by a geographic barrier, like...
Limits to Natural Selection01:38

Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...

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Video Experimental Relacionado

Updated: Jun 7, 2026

Determination of Self-(In)compatibility and Inter-(In)compatibility Relationships in Citrus Using Manual Pollination, Microscopy, and S-Genotype Analyses
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La selección de especies mantiene la autoincompatibilidad.

Emma E Goldberg1, Joshua R Kohn, Russell Lande

  • 1Department of Biological Sciences, University of Illinois at Chicago, 840 West Taylor Street, M/C 067, Chicago, IL 60607, USA.

Science (New York, N.Y.)
|October 23, 2010
PubMed
Resumen
Este resumen es generado por máquina.

La autoincompatibilidad, un rasgo que promueve el cruce externo, aumenta significativamente las tasas de diversificación de especies en la familia de las Solanáceas. Esta ventaja evolutiva compensa los beneficios a corto plazo de la autofertilización, favoreciendo el cruce obligatorio.

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Área de la Ciencia:

  • Biología evolutiva Biología evolutiva.
  • Especificación de la plantación.
  • Biología Reproductiva Biología Reproductiva.

Sus antecedentes:

  • La comprensión de los factores que impulsan la diversidad de especies es un objetivo clave en la biología evolutiva.
  • Los rasgos que influyen en las tasas de especiación y extinción son difíciles de detectar, especialmente si la transición es frecuente.
  • La autoincompatibilidad, que impone el cruce externo en los hermafroditas, a menudo se pierde en las plantas con flores, lo que facilita la autofertilización.

Objetivo del estudio:

  • Investigar el impacto de la autoincompatibilidad en las tasas de diversificación dentro de la familia Solanaceae.
  • Para determinar si la pérdida de autoincompatibilidad influye en la diversidad de especies.
  • Para evaluar las consecuencias evolutivas a largo plazo de la autofertilización frente al cruce obligatorio.

Principales métodos:

  • Análisis comparativo de las tasas de diversificación entre las especies de Solanáceas.
  • Reconstrucción filogenética para rastrear la evolución de la autoincompatibilidad.
  • Modelado estadístico para correlacionar las estrategias reproductivas con las tasas de especiación y extinción.

Principales resultados:

  • Las especies dentro de la familia Solanaceae que exhiben autoincompatibilidad funcional se diversifican a tasas significativamente más altas.
  • La pérdida de la autoincompatibilidad, que conduce a la autofertilización, no confiere una ventaja de diversificación a largo plazo.
  • La selección de especies favorece fuertemente el cruce obligatorio sobre la autofertilización a largo plazo.

Conclusiones:

  • La autoincompatibilidad funcional es un rasgo clave que promueve mayores tasas de especiación en las Solanáceas.
  • La trayectoria evolutiva favorece las estrategias de cruce externo, a pesar de los posibles beneficios a corto plazo de la autofertilización.
  • Los sistemas reproductivos juegan un papel crítico en la configuración de los patrones macroevolutivos de la biodiversidad.