Most mutations are not harmful, but some can be. A harmful mutation can result in a genetic disorder or even cancer. Another kind of mutation is a chromosomal mutation. Chromosomes, located in the cell nucleus, are tiny threadlike structures that carry genes.

Are there any good genetic mutations?

Most gene mutations have no effect on health. And the body can repair many mutations. Some mutations are even helpful. For example, people can have a mutation that protects them from heart disease or gives them harder bones.

What percent of genetic mutations are harmful?

Using several techniques to gauge the effects of these mutations, which are the most common type of variant in the human genome, Akey estimated that more than 80 percent are probably harmful to us.