Consistent mutations and the process of evolution made it so that most mammals on Earth five fingers. This feature is inherited from ancient fish.
Researchers from the University of Montreal in the framework of scientific work proved that the formation of fingers in humans and the fish fins of the bony fish has similar mechanisms of development. For these processes meets the same couple of genes.
According to the experiment, in mice at embryonic stage of development genes are activated in different parts of the rudiment of the limbs. Fish genes are in the same place, which leads to the formation of fin.
With all this, the essence and function of pairs of genes of mammals and fish alike. This fact once again confirms the existence of evolution and the origin of all organisms on the planet from a single view.