Video Experimental Relacionado
Updated: Aug 9, 2026
07:40
A Noninvasive Hair Sampling Technique to Obtain High Quality DNA from Elusive Small Mammals
Published on: March 13, 2011
La incertidumbre en la ciencia: ¿es el panda gigante un oso o un mapache?
Nature
|October 5, 1986
Resumen
Los pandas gigantes están confirmados como osos, a pesar de las dudas del pasado. Estas dudas surgieron de los vínculos percibidos con los pandas menores y los datos moleculares debatidos, pero la evidencia ahora solidifica su clasificación de ursina.
Área de la Ciencia:
- Zoología Zoología Zoología.
- Mammalogía es la mamalogía.
- Biología evolutiva Biología evolutiva.
Sus antecedentes:
- La clasificación taxonómica del panda gigante (Ailuropoda melanoleuca) ha sido debatida históricamente.
- Las dudas persistentes a menudo se derivan de su relación percibida con el panda rojo (Ailurus fulgens).
- Las controvertidas interpretaciones de los datos moleculares también han contribuido a las incertidumbres de clasificación.
Objetivo del estudio:
- Para resolver definitivamente el estatus taxonómico del panda gigante.
- Para abordar las dudas persistentes con respecto a su clasificación como oso (familia Ursidae).
Principales métodos:
- Análisis de datos de secuencias moleculares.
- Estudios comparativos de filogenética.
Principales resultados:
- Los datos de secuencia molecular y los análisis filogenéticos colocan consistentemente al panda gigante dentro de la familia de los osos, Ursidae.
- La evidencia refuta una estrecha relación evolutiva entre el panda gigante y el panda rojo.
Conclusiones:
- El panda gigante se clasifica inequívocamente como un oso.
- Se resuelven las dudas anteriores basadas en las comparaciones con el panda rojo y las interpretaciones de datos moleculares.
Videos de Conceptos Relacionados
01:39Epistasis
In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
02:04Conservation of Small Populations
Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less likely to...
01:54Convergent 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...
00:59Uncertainty: Overview
In analytical chemistry, we often perform repetitive measurements to detect and minimize inaccuracies caused by both determinate and indeterminate errors. Despite the cares we take, the presence of random errors means that repeated measurements almost never have exactly the same magnitude. The collective difference between these measurements - observed values - and the estimated or expected value is called uncertainty. Uncertainty is conventionally written after the estimated or expected value.
01:17Wald-Wolfowitz Runs Test II
The Wald-Wolfowitz runs test, commonly referred to as the runs test, is a nonparametric test used to assess the randomness of ordered data. The test evaluates the number of runs, which are consecutive sequences of similar elements within the data. If the number of runs is significantly higher or lower than expected, the data is considered non-random, indicating a detectable pattern or structure.
For binary data, runs are identified using symbols such as + and −, or equivalently, 1s and 0s. In...
For binary data, runs are identified using symbols such as + and −, or equivalently, 1s and 0s. In...
01:05Instinctive Drift
Instinctive drift refers to the tendency of animals to revert to their innate behaviors despite repeated reinforcement. Breland and Breland demonstrated this concept in an experiment with a raccoon. The raccoon was trained to pick up two coins and place them in a container in exchange for food. Initially, the raccoon learned to associate the coins with food, making them a conditioned stimulus or a substitute for food. However, over time, the raccoon became less willing to put the coins into the...