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Question

In polygenic traits when the bell curve distribution of traits moves to one end of the curve because of a preference for best fit of that trait. What's this shift called?

Answer

What is directional selection? Explanation: Directional selection refers to the process by which certain characteristics or traits of a species become more common within a population over time due to natural selection. This occurs when individuals possessing a certain advantageous variation are better able to survive and reproduce, leading to the gradual shift in the distribution of traits towards the favored variation.