00:01
All right, so this question is about a lake.
00:06
So we're gonna draw this little lake.
00:08
And they call this lake a.
00:11
And lake a used to have only dark color fish.
00:14
So i'm just gonna draw a few fish here.
00:16
Oh, hi, i'm not good at drawing fish.
00:22
Okay, so the question says that these are the ancestral phenotype.
00:29
So this dark color phenotype has been around, you know, for the whole time the lake has been in existence.
00:35
And all of a sudden, there are a bright colored fish that arise over time.
00:44
So what this is saying here, and it gives you three possible scenarios of what's happening here, evolutionary speaking, a, b, and c.
00:55
I'm going to just track the correct answer, which is c.
01:01
So the first thing that we see take place here is mutation.
01:04
And what that means is during reproductive cycle of one of these ancestral dark color fish, there was a dna error that caused a change in the pigment gene to cause these bright colored fish to rise over time...