Question

1. 
   Your Stickleback Pelvic Phenotype Totals 20 20 Bear Paw Lake Frog Lake 18 16 15 14 12 Number of fish 10 8 6 4 4 2 0 0 0 Complete Reduced Absent Pelvic score
   What conclusion can you draw from your graph in Experiment 1?
2. One of the functions of pelvic spines in the ocean is to protect stickleback from larger fish predators. Based on this knowledge, what might be a possible explanation for the differences in pelvic spines between Bear Paw Lake and Frog Lake sticklebacks?
3. What is the relationship between age and position of sediment layers in the Nevada lake quarry?
4. How would you test whether the ancient Nevada lake contained predatory fish?
5. Living populations tell us about mechanisms of selection; fossils provide a record of change over time. Based on what you have learned in this virtual lab, would you agree or disagree with this statement?