One of the proofs that mutations inflict only harm on living things is the coding of the genetic code. In developed animals, almost all the known genes contain more than one piece of information about that organism. For example, a single gene may control both height and eye color.

The molecular biologist Michael Denton describes this feature, known as genes’ pleiotropic effect:

[quote cite=”Micheal Denton”]The effects of genes on development are often surprisingly diverse. In the house mouse, nearly every coat-colour gene has some effect on body size. Out of seventeen X-ray-induced eye colour mutations in the fruit fly Drosophila melanogaster, fourteen affected the shape of the sex organs of the female, a characteristic that one would have thought was quite unrelated to eye colour. Almost every gene that has been studied in higher organisms has been found to ef