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Videos de Conceptos Relacionados

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...
Asexual Reproduction02:38

Asexual Reproduction

Asexual reproduction allows plants to reproduce without growing flowers, attracting pollinators, or dispersing seeds. Offspring are genetically identical to the parent and produced without the fusion of male and female gametes.
Monohybrid Crosses01:20

Monohybrid Crosses

Overview
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...
Chromosomal Theory of Inheritance01:39

Chromosomal Theory of Inheritance

In 1866, Gregor Mendel published the results of his pea plant breeding experiments, providing evidence for predictable patterns in the inheritance of physical characteristics. The significance of his findings was not immediately recognized. In fact, the existence of genes was unknown at the time. Mendel referred to hereditary units as “factors.”

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The influence of gametophytic competition on sporophytic quality in Dianthus chinensis.

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Video Experimental Relacionado

Updated: Jul 12, 2026

Determination of Self- and Inter-(in)compatibility Relationships in Apricot Combining Hand-Pollination, Microscopy and Genetic Analyses
08:08

Determination of Self- and Inter-(in)compatibility Relationships in Apricot Combining Hand-Pollination, Microscopy and Genetic Analyses

Published on: June 16, 2020

La autoincompatibilidad gametofítica fue reexaminada.

D L Mulcahy, G B Mulcahy

    Science (New York, N.Y.)
    |June 17, 1983
    PubMed
    Resumen

    La visión tradicional de la autoincompatibilidad en las plantas con flores puede ser demasiado simple. La nueva evidencia sugiere que muchos genes, no solo unos pocos, controlan las interacciones al estilo del polen, lo que potencialmente cambia nuestra comprensión de la reproducción de las plantas.

    Área de la Ciencia:

    • Biología reproductiva de las plantas Biología reproductiva de las plantas
    • Genética La genética.
    • Biología molecular La biología molecular.

    Sus antecedentes:

    • La autoincompatibilidad gametofítica (ISG) en las angiospermas se explica tradicionalmente por unos pocos loci multialélicos que inhiben el crecimiento del tubo de polen.
    • Recientes hallazgos experimentales desafían este modelo, sugiriendo una base genética más compleja con numerosos loci involucrados.

    Objetivo del estudio:

    • Proponer una hipótesis alternativa para la autoincompatibilidad gametofítica.
    • Integrar datos recientes que indican múltiples loci en un nuevo marco teórico.
    • Explorar el papel de las extensas interacciones al estilo del polen en la reproducción de las plantas.

    Principales métodos:

    • Revisión y síntesis de los datos experimentales existentes sobre la autoincompatibilidad.

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    Videos de Experimentos Relacionados

    Last Updated: Jul 12, 2026

    Determination of Self- and Inter-(in)compatibility Relationships in Apricot Combining Hand-Pollination, Microscopy and Genetic Analyses
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    Determination of Self-(In)compatibility and Inter-(In)compatibility Relationships in Citrus Using Manual Pollination, Microscopy, and S-Genotype Analyses
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  • Desarrollo de un modelo teórico que incorpore múltiples loci e interacciones complementarias.
  • Análisis comparativo de las hipótesis convencionales y alternativas.

    • Principales resultados:

    • La hipótesis convencional con pocos loci no explica completamente las observaciones experimentales actuales.
    • Un modelo alternativo que involucra numerosos loci e interacciones complejas al estilo del polen proporciona un mejor ajuste para los datos.
    • Este modelo alternativo sugiere que la autoincompatibilidad gametofítica podría ser una faceta de interacciones más amplias al estilo del polen, posiblemente sin un solo gen S.

    Conclusiones:

    • El modelo establecido de autoincompatibilidad gametofítica requiere revisión.
    • Un modelo basado en múltiples locus e interacción ofrece una explicación más completa de los mecanismos de autoincompatibilidad en las angiospermas.
    • Se necesita más investigación para dilucidar la intrincada red de interacciones al estilo del polen que gobiernan la reproducción de las plantas.