A population of lizards varies in heritable characteristics...

A population of lizards varies in heritable characteristics such as color, tree climbing ability and ability to run on the ground. The primary predators of the lizards are birds and foxes. Use these traits to describe a scenario in which evolutionary change driven by natural selection could be considered: a. Directional b. Disruptive *note, please create scenarios that BOTH a and b could occur, based on the traits provided in the question.

Transcript

00:01 All right, i'm excited because we're going to talk about lizards.

00:03 I call my pet lozards just because he hangs around the front porch of my house.

00:09 I call him salsa.

00:10 He's so sweet.

00:13 Brings a little presence of half -eaten leaves sometimes.

00:16 It's great.

00:17 But the lizards we're talking about, we want to see a little bit of the micro -revolution and genetic diversity that can happen depending on the environment.

00:29 So these lizards have a variety of colors.

00:32 And they vary based on their ability to climb trees and run on the ground.

00:37 And they have two different types of predators.

00:39 There are birds and there are foxes.

00:43 Okay, so ways that we can have different genetic variations and a shift in the population based on environment and certain natural selections.

00:57 First one we're going to talk about is directional selection.

01:00 In directional selection, one certain features.

01:04 Phenotype is going to be more favorable than all the others.

01:14 This is because one phenotype will make you more likely to survive and produce and be able to pass on your genetic code, be able to produce offspring, then another one.

01:28 So for example, if you had a lizard population where all of a sudden the fox population increased, the ability to climb trees would be favored.

01:55 And that would be the phenotype that would be favored...

Question

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