- News Home
17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
- About Us
ScienceShot: How Some Goldfish Got Two Tails
25 February 2014 11:00 am
The twin tails of some prized goldfish varieties didn't arise naturally: Ancient Chinese fish aficionados deliberately bred for this trait. Chinese started keeping goldfish for their ornamental value around the year 1000, during the Song Dynasty. About 600 years later, during the Ming Dynasty, domesticated goldfish with one right tail and another on the left appear in historical records. Such fish are rarely seen in nature. Researchers have now traced this distinctive feature to a genetic mutation in a gene that controls development of the back end of the spine. In normal goldfish, there is a single set of bones in the tail. In goldfish with the mutation, the tail skeleton splits into mirror image left and right sides. The genetic mutation arose naturally, but then twin-tail goldfish varieties were "established and maintained by breeders in Song to Ming dynasty China," the researchers report online today in Nature Communications.