The Genetic Basis of Adaptation. Activity 12: The Genetic Basis of Adaptation LIMITED LICENSE TO MODIFY. These PowerPoint® slides may be modified only

Activity 12

The Genetic Basis of Adaptation

Activity 12: The Genetic Basis of Adaptation

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Activity 12: The Genetic Basis of AdaptationActivity 12: The Genetic Basis of Adaptation



Get Started

What do you predict is eventually likely to happen to the population of mice in the darker environment?


Introduction

A biological adaptation, or adaptation, is an inherited characteristic that favors the survival or reproduction of an organism, and is the result of natural selection.

Read the introduction.


How did a change in the environment lead to genetic changes in populations of the rock pocket mouse?

Challenge


Procedure

Coat color in rock pocket mice is determined by a single gene that follows a dominant—recessive pattern.


Procedure

D – dark-colored coat, dominant allele d – light-colored coat, recessive allele Possible genotypes:◦DD – homozygous-dominant dark mouse◦Dd – heterozygous dark mouse◦ dd – homozygous-recessive light mouse


Procedure

Student 1: D, d Student 2: d, d Student 3: d, d Student 4: d, d


Generation Number of D alleles in parent mouse population

Number of d alleles in parent mouse population

Total number of light-colored offspring mice

Total number of dark-colored offspring mice

Procedure


Procedure

Add information from this activity or a previous activity to support whether any of the statements are correct or incorrect.

Return to Student Sheet 3.1, “Ideas about Evolution”


Follow Up

How does the final population of mice compare to the population you began with?

Why was genetic diversity important to the survival of the mice in the dark environment?


Follow Up

How would a scientist who studies processes such as natural selection use models?

Is there anything you would change in the model we used that would improve its accuracy?


Follow Up

Explain how a change in the environment led to selection for:◦ a. genetic changes in the population of mice

over several generations.◦ b. phenotypic changes in the population of

mice over several generations.

Analysis 1


How did a change in the environment lead to genetic changes in populations of the rock pocket mouse?

Revisit the Challenge


adaptation allele biological adaptation evolution evolve gene genetic diversity

Key Vocabulary

Documents

The Genetic Basis of Adaptation. Activity 12: The Genetic Basis of Adaptation LIMITED LICENSE TO MODIFY. These PowerPoint® slides may be modified only