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Neoteny (/ n i ˈ ɒ t ən i /), [1] [2] [3 ... The axolotl is a neotenous salamander, often retaining gills throughout its life. Neoteny has been observed in many ...
Neoteny is the term for reaching sexual maturity without undergoing metamorphosis. [36] The genes responsible for neoteny in laboratory animals may have been identified; however, they are not linked in wild populations, suggesting artificial selection is the cause of complete neoteny in laboratory and pet axolotls. [37]
Neoteny has been implicated as a developmental cause for a number of behavior changes, as a result of increased brain plasticity and extended childhood. [28] Progenesis (or paedogenesis) can be observed in the axolotl (Ambystoma mexicanum). Axolotls reach full sexual maturity while retaining their fins and gills (in other words, still in the ...
The axolotl continues to thrive in captivity though and is highly regarded by scientists studying regeneration. That's because the amphibian can regenerate brains, jaws and even spines without ...
The axolotl can grow up to 12 inches and weigh anywhere from three to eight pounds, and its average lifespan in the wild is 10-15 years. Most axolotls are dark brown with some black speckling, but ...
The 1.7GB draft genome of Xenopus tropicalis was the first to be reported for amphibians in 2010. [137] Compared to some salamanders this frog genome is tiny. For instance, the genome of the Mexican axolotl turned out to be 32 Gb, which is more than 10 times larger than the human genome (3GB).
A textbook example of neoteny, the axolotls are members of the tiger salamander complex, yet they become sexually mature in larva form, remaining aquatic and gilled. With a treatment of thyroxine , it is possible to induce an axolotl to develop into a salamander, demonstrating that axolotl genome still retains information on its lost adult form.
The axolotl has three pairs of external gills. This type of gill is most commonly observed on the aquatic larva of most species of salamanders, lungfish, and bichirs (which have only one large pair), and are retained by neotenic adult salamanders and some species of adult lungfish.