When the population mean for a given measured trait is observed to decline over the course of several generations,it is an example of disruptive selection.

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Disruptive selection refers to a scenario where extreme trait values are favored over intermediate ones, leading to bimodal distribution. A declining population mean does not necessarily indicate disruptive selection, but could be due to other factors such as environmental changes or genetic drift.

When the Population Mean for a Given Measured Trait Is