In a population of butterflies there is a gene responsible...

In a population of butterflies, there is a gene responsible for wing coloration. A forest fire changes the environment, making the habitat darker. Over several generations, the proportion of dark-colored butterflies increases significantly due to predators being less able to spot them against the darker background. What type of natural selection is likely occurring in this butterfly population? Group of answer choices Disruptive selection Sexual selection Directional selection Artificial selection Stabilizing selection

Transcript

00:02 Hi guys.

00:03 So today we're going to talk about different types of selection.

00:07 For example, say you have an african butterfly species and out of all the phenotypes, there's pressure to make it be only one pattern for that.

00:21 It's only one phenotype.

00:22 So only one pattern on the wings instead of multiple different ones for the same species.

00:27 What type of selection would this be? so we have some answers that i'm going to go.

00:33 And the main ones to consider are disruptive and stabilizing selection or directional selection disruptive selection would be like this first graph over here that i have and just keeping in mind so your original you know types ranged like this blue line so there could be say for example one two and three phenotypes that occur so different patterns of butterflies.

01:06 When disruption selection happens, it only chooses like in this pattern like this.

01:14 So only phenotypes one and three would be selected.

01:21 So there would be pressure to have two of the three phenotypes in this example.

01:27 So we know that that would not be what the butterflies, what's happening to the butterflies.

01:34 So another one to think about is directional selection.

01:41 And so this would be, if you have two different little waves here, it pushes for one phenotype over here or only one phenotype over here...

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