Both your answers are right. Another reason is that evolution has been operating on the basic human genotype for a very long time and has likely found most of the one gene beneficial mutations and has had time to spread them. But because of copying error evolution is always able to “find” new harmful mutations.
Both your answers are right. Another reason is that evolution has been operating on the basic human genotype for a very long time and has likely found most of the one gene beneficial mutations and has had time to spread them. But because of copying error evolution is always able to “find” new harmful mutations.