Gene sequences that remain very similar over many species are said to be

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Gene sequences that remain very similar over many species are said to be highly conserved. This is because they have remained functionally important throughout evolution and any changes in these sequences may have negative effects on the organism's survival. Noncoding regions, on the other hand, may have more variation between species since they may not be under as much selective pressure. While the terms "the same" and "of the same family" may be applicable in some cases, they do not adequately describe the concept of conservation of gene sequences. Finally, while some sequences may be resistant to mutation, this is not necessarily indicative of their conservation.

Gene Sequences That Remain Very Similar Over Many Species Are