Video Experimental Relacionado
Updated: May 1, 2026

08:14
Who is Who? Non-invasive Methods to Individually Sex and Mark Altricial Chicks
Published on: May 24, 2014
18.0K
Muela de las plumas de la cola en un oviraptorisaurio juvenil
1Department of Ecology and Evolutionary Biology, and Peabody Natural History Museum, Yale University, New Haven, Connecticut 06520-8150, USA. richard.prum@Yale.edu
Nature
|November 5, 2010
Resumen
Las plumas de oviraptorisauros recién descubiertas de China sugieren que el Similicaudipteryx juvenil había fosilizado gérmenes de plumas en desarrollo, no plumas de cola especializadas. Este hallazgo ofrece nuevos conocimientos sobre la evolución temprana de las plumas.
Área de la Ciencia:
- Paleontología Paleontología.
- Biología evolutiva Biología evolutiva.
- Investigación de fósiles Investigación de fósiles.
Sus antecedentes:
- La Formación Yixian en Liaoning, China, es famosa por sus fósiles excepcionalmente preservados, incluidos los dinosaurios emplumados.
- Los oviraptorosaurios, un grupo de dinosaurios terópodos emplumados, proporcionan datos cruciales para comprender la evolución de las aves.
- La morfología y el desarrollo de las plumas en especies extintas son clave para reconstruir su biología e historia evolutiva.
Videos de Conceptos Relacionados
Gastrulation
52.8K
Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata...
52.8K
Lampbrush Chromosomes
7.1K
In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops...
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops...
7.1K
Zygotic Development And Stem Cell Formation
6.4K
The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...
6.4K
Accessory Structures of the Skin: Hair and Hair Follicles
5.2K
Hair and hair follicles are integral components of the integumentary system. Hair is a filamentous structure composed mainly of a protein called keratin. It is found on the surface of the skin throughout the body, except for areas such as the palms of the hands and soles of the feet.
Hair is a keratinous filament growing out of the epidermis. It is primarily made of dead, keratinized cells. Hair strands originate at the epidermal penetration called the hair follicle. The hair shaft is the part...
Hair is a keratinous filament growing out of the epidermis. It is primarily made of dead, keratinized cells. Hair strands originate at the epidermal penetration called the hair follicle. The hair shaft is the part...
5.2K

