In Darwin's time,natural selection was thought to be primarily negative.However,we have since learned that positive selection is a powerful force,and it

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Positive selection retains gene variants or combinations that promote successful reproduction, increasing their frequency in a population over time. This leads to the evolution of traits that are beneficial for survival and reproduction, and is a powerful force in shaping the diversity of life on Earth. However, it does not necessarily create new gene variants or enable us to alter our genotypes. Resistance to infectious diseases may also be a product of positive selection, but this is just one example of how it operates.

In Darwin's Time,natural Selection Was Thought to Be Primarily Negative