The Genetic Basis of Adaptation

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Activity 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?

Activity 12: The Genetic Basis of Adaptation 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.

Activity 12: The Genetic Basis of Adaptation  How did a change in the environment lead to genetic changes in populations of the rock pocket mouse? Challenge

Activity 12: The Genetic Basis of Adaptation Procedure  Coat color in rock pocket mice is determined by a single gene that follows a dominant—recessive pattern.

Activity 12: The Genetic Basis of Adaptation 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

Activity 12: The Genetic Basis of Adaptation Procedure  Student 1: D, d  Student 2: d, d  Student 3: d, d  Student 4: d, d

Activity 12: The Genetic Basis of Adaptation GenerationNumber 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 miceProcedure

Activity 12: The Genetic Basis of Adaptation 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”

Activity 12: The Genetic Basis of Adaptation 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?

Activity 12: The Genetic Basis of Adaptation 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?

Activity 12: The Genetic Basis of Adaptation 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

Activity 12: The Genetic Basis of Adaptation  How did a change in the environment lead to genetic changes in populations of the rock pocket mouse? Revisit the Challenge

Activity 12: The Genetic Basis of Adaptation  adaptation  allele  biological adaptation  evolution  evolve  gene  genetic diversity Key Vocabulary