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?Stabilizing selectionDirectional selectionDisruptive selectionNonjunction selection

Answer 1

In a population, we have a continuous of genotypes that show a Gaussian (bell) distribution, depending on the type of selection this can change, when this selection goes over the extreme genotypes is disruptive as the intermediate genotype lessen its frequency, now when only goes to one side we say that is directional as only one extreme is selected. Therefore we can say that the correct answer is Directional selection.