関連する実験動画

Updated: May 17, 2026

Assessing Species-specific Contributions To Craniofacial Development Using Quail-duck Chimeras
09:38

Assessing Species-specific Contributions To Craniofacial Development Using Quail-duck Chimeras

Published on: May 31, 2014

北米の羽毛のある非鳥類恐竜は,翼の起源についての洞察を提供している

Darla K Zelenitsky1, François Therrien, Gregory M Erickson

  • 1Department of Geoscience, University of Calgary, Calgary, Alberta T2N 1N4, Canada. dkzeleni@ucalgary.ca

Science (New York, N.Y.)
|November 1, 2012
PubMed
まとめ

オルニトミモサウルと呼ばれる羽ばたき恐竜は,以前は羽毛を持つことが知られていなかったが,繊維状の羽毛と成人の翼構造の証拠を示している. この発見は,原始の翼が,マニラプトラ以外のセロポッドに先行して進化したことを示唆している.

さらに関連する動画

Using Avian Skin Explants to Study Tissue Patterning and Organogenesis09:30

Using Avian Skin Explants to Study Tissue Patterning and Organogenesis

Published on: September 15, 2023

Creating Avian Forebrain Chimeras to Assess Facial Development04:10

Creating Avian Forebrain Chimeras to Assess Facial Development

Published on: February 18, 2021

関連する概念動画

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 Fossil Record02:56

The Fossil Record

The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
The Evidence for Evolution02:55

The Evidence for Evolution

Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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.
Phylogeny01:23

Phylogeny

Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
Determination01:51

Determination

During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In contrast, determination...