For this example, we want to place the statements below in the Venn diagram, depending on whether they describe natural selection, artificial selection, or both. Alright. So here's our Venn diagram. Natural selection on the left, both in the middle, and artificial selection on the right. Alright.
So let's go through these statements one by one. Statement A says, "Over time, the frequency of a trait in the population will change." So what do you think? Natural selection, artificial selection, or both? Both natural selection and artificial selection will cause a change in the trait over time in the population.
So that's going to get A in the middle there. Alright. Next, we have B: "Organisms with certain traits reproduce at a higher rate." Natural selection, artificial selection, or both?
That's going to be true for both again, and it's just we're talking about the reason that they're reproducing at a higher rate. With artificial selection, it's due to people selecting, whereas with natural selection, it's due to the environment selecting, but both have differences in reproduction. Alright. Next, we have C: "Breeding is controlled by humans."
Where does that go? Well, just said it. Right? Breeding controlled by humans. That's the key definition of artificial selection.
We'll put the C there. Next, we have D: "More offspring are produced than will survive or reproduce." Where does that go? Alright.
Again, that's going to be true for both. More offspring are produced than could possibly survive or reproduce in both cases. Again, the difference is just why they're surviving or reproducing. So D goes in the middle. Then we have E, "Competition for environmental resources or mates determines survival and reproduction." Where does that go?
Right. Well, that's keying in on that reason, and that reason is the environment. So, that's natural selection. We'll put the E out here, and our last one, F: "Requires variation in the population." Where does that go?
For change to happen, we must have variation in the population. So F goes in the middle for both. Alright. So remember, natural selection and artificial selection—some people really argue they're just the same thing. The key difference is what is choosing which organisms survive and reproduce.
If it's the environment, it's natural selection. If it's humans, it's artificial selection. Practice problems after this, and I'll see you there.