ONLY for "HELPCLICK"...Biology Lab #1_FALL
AlphaMann
natural_selection_lab-report-for-helpclick.docxNatural Selection LAB REPORT
Access the Natural Selection Virtual Lab: http://www.mhhe.com/biosci/genbio/virtual_labs/BL_12/BL_12.html
Use this outline to take notes prior to attempting the online lab report.
DIRECTIONS:
Experiment 1
1. choose the urban environment and begin with the allele frequencies A = 0.2 and a = 0.8
2. click the Generation 1 button, then natural selection button, and record the allele frequencies in your Data Table 1.
3. click the Generation 2 button, then natural selection button, and record the allele frequencies in your Data Table 1.
4. continue through each generation.
5. select the urban environment again with allele frequencies A = 0.4 and a = 0.6.
6. repeat the same steps to view each generation and record the allele frequencies.
7. continue this until the entire Data Table 1 is complete.
Data Table 1.
|
|
A = 0.2 a = 0.8 |
A = 0.4 a = 0.6 |
A = 0.5 a = 0.5 |
A = 0.6 a = 0.4 |
|
Generation 1 |
A = a = |
A = a = |
A = a = |
A = a = |
|
Generation 2 |
A = a = |
A = a = |
A = a = |
A = a = |
|
Generation 3 |
A = a = |
A = a = |
A = a = |
A = a = |
|
Generation 4 |
A = a = |
A = a = |
A = a = |
A = a = |
|
Generation 5 |
A = a = |
A = a = |
A = a = |
A = a = |
Experiment 2
1. choose the grasslands environment and begin with the allele frequencies A = 0.2 and a = 0.8
2. click the Generation 1 button, then natural selection button, and record the allele frequencies in your Data Table 2.
3. click the Generation 2 button, then natural selection button, and record the allele frequencies in your Data Table 2.
4. continue through each generation.
5. select the grasslands environment again with allele frequencies A = 0.4 and a = 0.6.
6. repeat the same steps to view each generation and record the allele frequencies.
7. continue this until the entire Data Table 2 is complete.
Data Table 2.
|
|
A = 0.2 a = 0.8 |
A = 0.4 a = 0.6 |
A = 0.5 a = 0.5 |
A = 0.6 a = 0.4 |
|
Generation 1 |
A = a = |
A = a = |
A = a = |
A = a = |
|
Generation 2 |
A = a = |
A = a = |
A = a = |
A = a = |
|
Generation 3 |
A = a = |
A = a = |
A = a = |
A = a = |
|
Generation 4 |
A = a = |
A = a = |
A = a = |
A = a = |
|
Generation 5 |
A = a = |
A = a = |
A = a = |
A = a = |
Did either allele A or a disappear from the population you studied? Why or why not?
Did the effect of natural selection vary with different starting allele frequencies in identical environments? Why or why not?
A population in which the frequency of alleles remains the same over generations is said to be in genetic equilibrium. Describe one mechanism by which a populations' genetic equilibrium can be disrupted and result in the process of evolution.
In which of the simulated environments do individuals of the genotype Aa survive best?
In which of the simulated environments do individuals of the genotype aa survive best?
