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4. Like Bear Paw Lake, nearby Kalmbach Lake is an Alaskan lake that historically had no native predatory fish. The Alaska Department of Fish and Game started introducing rainbow trout into Kalmbach Lake in 1982. Prior to these introductions, the pelvic reduction was common in this stickleback population. The rainbow trout are known to prey on stickleback. What would you hypothesize has happened to the stickleback population in the more than 30 generations that have elapsed since the trout was introduced?  

3. One of the functions of pelvic spines in the ocean is to protect stickleback from larger fish predators. Based on this knowledge, which statement might be a possible explanation for the differences in pelvic spines between Bear Paw Lake and Frog Lake sticklebacks?  

25. What is the name of the syndrome that is an intersex condition characterized by the presence of 45 chromosomes in the nucleus, where only 1 X chromosome is observed?

18. What is the purpose of looking for evidence of left or right bias in pelvic asymmetry in stickleback populations?

10. Is the following statement true or false? As they adapted to life in fresh water, all stickleback populations living in lakes in Alaska underwent exactly the same evolutionary changes.

9. What happened to these fish as they adapted to living exclusively in freshwater?  

19. Which of the following is a reason for collecting specimens by random sampling when conducting the type of research in this virtual lab?

12. Why do some stickleback populations lack pelvic spines?

2.  Bear Paw Lake and Frog Lake were likely populated by the same sea-run population of stickleback at the end of the last ice age. Which of the following statements is the most reasonable explanation for what might have happened to the stickleback in each lake since colonization?  

1. Based on what you have learned so far about threespine stickleback fish, which of the following statements is most accurate: