How Do Mitochondrial Dna Evolve Non-Neutrally?

With a new study on evolution, scientists have discovered that the mitochondrial genomes of birds have found two mutations within the mitochondrial genomes within fifty years. Within those fifty years it has shown two mutations within the mitochondrial genomes which can debunk the two percent of evolution per million years. By studying individual chickens Professor Greger Larson at Oxford University's Research Laboratory for Archaeology, they have found two mutations in the mitochondrial genomes. Now the chickens that were chosen for this were those of a long-term line of chickens that were inbred. For quite some time now scientists believed that rate at which the mitochondrial genome would not exceed two percent every million years, but
When they are removed very quickly it gives off the feeling as if there was some kind of short term - mitochondrial evolution but now there is also direct evidence that shows that it is not always inherited from the mother. According to the study lead author Dr Michelle Alexander, from the University of York, she said that " The one thing everyone knew about mitochondria is that it is almost exclusively passed down the maternal line " . But now there is proof that shows that it is not always inherited from the mother since there were chicks that have inherited their mitochondria from the father. Though even we have this new discovery of a mutation within the chicken is will not affect the species entirely other than giving them a few modifications, It will not create an entirely new species. Even though animals do evolve, evolution is limited. Snails can't just evolve and turn into a human, no there are limits to what evolution can bring, but unless they are exposed to a major amount of radiation which causes them to mutate into something different entirely as we have seen with past images of exposure to