Question

experiment 1: analyze stickleback fish from lakes quiz: question 3 3. based on what you have learned so far about threespine stickleback fish, which of the following statements is most accurate: a. the stickleback population in bear paw lake is more similar to marine and sea - run stickleback populations in terms of pelvic morphology than it is to the frog lake stickleback population. b. the stickleback populations in bear paw lake and frog lake are both freshwater populations; thus, they are more similar to one another in pelvic morphology than they are to marine and sea - run stickleback populations. c. the stickleback population in frog lake is more similar to marine and sea - run stickleback populations in terms of pelvic morphology than it is to the bear paw lake stickleback population. d. there is a lot of variation in pelvic morphology within each population of threespine stickleback fish.

Explanation:

To solve this, we analyze each option:

• Option A: Bear Paw Lake sticklebacks typically have reduced pelvic structures, while marine/sea - run have well - developed pelvises. Frog Lake may also have reduced pelvises, so Bear Paw is not more similar to marine than Frog. Eliminate A.
• Option B: Bear Paw and Frog Lake are freshwater. Marine/sea - run sticklebacks have well - developed pelvic structures, while freshwater populations (like these two lakes) often have reduced pelvic morphology. So they are more similar to each other than to marine/sea - run. This is correct.
• Option C: Frog Lake sticklebacks are freshwater, so they should be more similar to Bear Paw (freshwater) than to marine/sea - run (with different pelvic morphology). Eliminate C.
• Option D: While there is some variation, the main pattern is the difference between freshwater and marine/sea - run in pelvic morphology, not a lot of variation within each population. Eliminate D.

Answer:

B. The stickleback populations in Bear Paw Lake and Frog Lake are both freshwater populations; thus, they are more similar to one another in pelvic morphology than they are to marine and sea - run stickleback populations.