"Positive selection" refers to a process where certain traits or characteristics are favored by nature or circumstances, leading to their gradual increase in a population over time. Full definition
Improving the performance of positive selection inference by filtering unreliable alignment regions. (unil.ch)
The method identifies gene sets that show evidence for positive selection in comparison with matched controls, and thus highlights genes for further functional studies. (religion.blogs.cnn.com)
Unlike humans, domestic dog breeds have been developed via heavy positive selection for specific traits. (caninejournal.com)