3.1.13 (HL)—Human-driven selection

Human actions can change selection pressures, shifting the frequency of inherited traits without creating those traits.

Show the chain: activity changes mortality or reproduction; existing heritable variants contribute unequally; offspring frequencies change. The result depends on the pressure and starting variation.

Poaching in Gorongosa removed more tusked elephants before reproduction, so tuskless females became more common.

No. It filtered existing variation by changing survival and reproduction.

Natural selection is not intentional breeding; human pressure can select without anyone choosing a trait.