Mutant Pigeon With Giant Legs

How does an acquired mutation arise?

Many mutations arise spontaneously. These spontaneous mutations are caused by errors in replication. With large numbers of DNA being replicated throughout the body on a daily basis, mistakes sometimes occur. The body has mechanisms to detect and repair these errors, but the mechanisms are not always effective. Mutations can also be triggered by external factors. These factors can include radiation, certain chemicals, or even viruses. External factors can influence the strength of the DNA and lead to an increased risk of mutations.