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Videos de Conceptos Relacionados

Speciation Rates01:07

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.
Convergent Evolution01:54

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...
Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
Eukaryotic Evolution01:24

Eukaryotic Evolution

The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
What is a Mode?01:07

What is a Mode?

The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
A data set with two modes is called bimodal. For example,...

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Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Paleontology. Did the Denisovans cross Wallace's Line?

Science (New York, N.Y.)·2013
Same author

A Neanderthal lower molar from Stajnia Cave, Poland.

Homo : internationale Zeitschrift fur die vergleichende Forschung am Menschen·2013
Same author

Human evolution out of Africa: the role of refugia and climate change.

Science (New York, N.Y.)·2012
Same author

Structure and functional significance of the transverse vesical fold.

Clinical anatomy (New York, N.Y.)·2010
Same author

Two hominin incisor teeth from the middle Pleistocene site of Boxgrove, Sussex, England.

Journal of human evolution·2010
Same author

Neanderthal exploitation of marine mammals in Gibraltar.

Proceedings of the National Academy of Sciences of the United States of America·2008

Video Experimental Relacionado

Updated: Jul 26, 2026

High-Speed Human Temporal Bone Sectioning for the Assessment of COVID-19-Associated Middle Ear Pathology
03:42

High-Speed Human Temporal Bone Sectioning for the Assessment of COVID-19-Associated Middle Ear Pathology

Published on: May 18, 2022

Tempo y modo en la evolución de los homínidos.

J E Cronin, N T Boaz, C B Stringer

    Nature
    |July 9, 1981
    PubMed
    Resumen

    La evolución humana no apoya el modelo de equilibrio puntuado. En cambio, el registro fósil de homínidos sugiere un proceso evolutivo más gradual con tasas variables de cambio a lo largo del tiempo.

    Área de la Ciencia:

    • La paleoantropología es la paleoantropología.
    • Biología evolutiva Biología evolutiva.
    • Los orígenes del hombre.

    Sus antecedentes:

    • El modelo de equilibrio puntuado propone largos períodos de estasis interrumpidos por rápidos cambios evolutivos.
    • Este modelo se ha aplicado para comprender los patrones evolutivos en varias especies, incluidos los homínidos.

    Objetivo del estudio:

    • Evaluar la aplicabilidad del modelo de equilibrio puntuado a la evolución humana.
    • Para analizar el registro fósil de homínidos en busca de evidencia de estasis y puntuación.

    Principales métodos:

    • Análisis del registro fósil de homínidos que abarca los últimos 4,0 millones de años.
    • Examen de los cambios morfológicos dentro del linaje homínido a lo largo del tiempo evolutivo.

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    Principales resultados:

    • No se encontraron ejemplos bien documentados de estasis en el registro fósil de homínidos.
    • No se identificaron pruebas claras que apoyen el cambio morfológico punteado (rápido).
    • El registro fósil indica períodos de diferentes tasas de cambio evolutivo.

    Conclusiones:

    • El modelo de equilibrio puntuado no explica adecuadamente la evolución humana.
    • Un modelo de cambio evolutivo gradual, con tasas fluctuantes, representa mejor el registro fósil de los homínidos.