Leg Evolved from Fins.
The theory of evolution explains that land creatures from sea creatures that evolved. Loco-motor of land animals, hands and feet, from the evolution of the form of fins.
Fernando Casares from the Spanish National Research Institute was provide genetic evidence that process of evolution in a study was published in the Journal Cell.
In his research, Casares injecting hoxd13 genes from mice in zebra-fish. Known, the resulting protein gene function in development autopoda, forerunner hands and feet (12/15/2012).
Zebra-fish have hoxd13, but produces smaller proteins from tetrapods animals such as mammals. With ekstrasalinan genes, researchers hope that more protein is produced.
Research are get surprising results. Zebra-fish was injected that gene apparently started to show autopoda progress. Organ continues to grow before the fish died four days later.
Casares theorized, hundreds of millions of years ago, the ancestors of tetrapods began to express genes hoxd13 until that autopoda can grow.