00:01
A population of beetles is surviving by eating the flowers of one particular species of plant in a meadow.
00:08
And the beetles do not leave the meadow because they can't fly very far.
00:12
The meadow is sprayed with herbicide and those plants all die.
00:17
Almost all of the beetles then die of starvation.
00:20
The few that survive happen to have longer wings and they are able to fly off and make it to another meadow where there are still some of the plants surviving.
00:29
There they start a new colony which now has beetles with long wings.
00:36
Explain what is happening in evolutionary terms.
00:40
Include one or more words from directional natural selection, disruptive natural selection, stabilizing selection, gene flow, migration, bottleneck, founder effect, genetic drift.
00:52
Read carefully and give the best interpretation.
00:55
That was long, but we only had to include one of those words.
01:00
So, i will focus on the differences between the directional and the disruptive and stabilizing.
01:10
So what we have here is, i will do some kind of job at drawing this, but we have our plants here and then they keep going, but this is kind of in a meadow.
01:31
And then we have more plants over here.
01:35
Right? and then we have our beetles that are normally just living here in peace and eating from these plants.
01:47
However, these plants get sprayed with this and these beetles cannot feed from them anymore.
02:01
And so, most of them die because they relied on feeding from these plants.
02:07
But some of them, the ones specifically the ones with longer wings are able to migrate, which i think was one of the words we had to use.
02:17
Yeah...