Evolution+Lab

=Go to the following website to complete a Natural Selection online lab=

@http://www.mhhe.com/biosci/genbio/virtual_labs/BL_12/BL_12.html

Background information

A = is the dominant allele a = recessive allele

AA = Gives the lizards yellow scales Aa = Gives the lizards brown scales aa = Gives the lizards grey scales

Directions: > for the rocky environment.
 * 1) Go to the upper right drop down bar and change it so A= 0.5 and a=0.5
 * 2) Write this number in generation 1 on your table for the rocky environment.
 * 3) Click generation 1 and then click natural selection
 * 4) Click generation 2
 * 5) Look at the allele frequencies in the bottom left and put the numbers in generation 2 on your table for the rocky environment.
 * 6) Click natural selection
 * 7) Click generation 3
 * 8) Look at the allele frequencies in the bottom left and put the numbers in generation 3 on your table
 * 1) Click natural selection
 * 2) Click generation 4
 * 3) Look at the allele frequencies in the bottom left and put the numbers in generation 4 on your table for the rocky environment.
 * 4) Click natural selection
 * 5) Click generation 5
 * 6) Look at the allele frequencies in the bottom left and put the numbers in generation 5 on your table for the rocky environment.
 * 7) Make a graph of your data.
 * 8) Click Reset
 * 9) Go to the left drop down bar and change the environment to the Desert environment
 * 10) Repeat steps 1-16
 * 11) Go to the left drop down bar and change the environment to the Grasslands environment
 * 12) Repeat steps 1-16
 * 13) Go to the left drop down bar and change the environment to the Urban environment
 * 14) Repeat steps 1-16
 * 15) Answer the following questions based on your results.

1. Did either allele A or a disappear from the population you studied? Why or why not? 2. In which of the simulated environments do individuals of the genotype Aa survive best? 3. In which of the simulated environments do individuals of the genotype aa survive best? 4. There is genetic variation in this population of lizards. What would have happened to the lizards each environment if there was no "a" allele? Meaning no variation. 5. In which environment was there no evolution? 6. If we paved over a grass park what would happen to the lizard population? 7. How did this lab demonstrate natural selection?