 The study examined the genetic makeup of Atlantic salmon, Salmos Alar. It found that the species had undergone a whole genome duplication event in its common ancestor, which resulted in the creation of two copies of every gene. The researchers then compared these copies to determine if they evolved differently. They found that while both copies retained their original function, one copy was subjected to more selective pressure than the other, resulting in one copy being more conserved than the other. Additionally, the researchers observed that the copies evolve at different rates, suggesting that one copy may have been selected against more quickly than the other. This article was authored by Holt Robert A., Moore Richard, Monroe Sarah, and others.