 Do: Natural Selection Beans  Learn: I can describe how natural selection works on a population  Connect: Trends, Relate Over Time

 How does natural selection affect a population over time?

 If natural selection does cause a population to become fit over time then I will observe (write what observations you think you will make) because (why you think this will happen)

 Bowl with six different sized holes  5 different types of beans  Lab report  Notebook paper

Type of Bean After trial 1 Start trial 2 After trial 2 Start trial 3 After trial 3 Start trial 4 After trial 4 Start trial 5 After trial 5

 One person in the group will be the shaker.  The other person in the group will be the counter  Both people will record the results on their lab report

 Place 5 beans of each type in your bowl.  Shake the bowl 10 times (no more) using a side to side motion  The ones that fall through the hole are considered dead. The ones that do not live to reproduce.  For each bean that remains in the bowl, add another one of the same type of bean.  Record your numbers  Repeat 4 more times.

 Why do organisms evolve over time?  How does natural selection work in a population of microbes?  What factors determine survival in your life?  What if the holes were larger than all the beans?  What if the holes were smaller than all the beans?  Which bean population increased most significantly? Why?  What changes might occur in microbes that would cause selective pressure?

 On notebook paper, make a bar graph for each of your bean “species” for all 5 trials. You should have 5 different graphs.  Color your bar graphs appropriately  Make sure you include a title and label all your axes.

 Claim: What caused the change in your microbe population over time?  Evidence: From your chart/bar graph numbers  Reasoning: How does this simulation apply to real bacteria?