time, a line graph is more appropriate, with the independent variable (x-axis) being time.4. Which statement below best describes what happened to the stickleback population in the ancient lakethat is now the Truckee Formation?A. The frequencies of reduced and complete pelvic phenotypes fluctuate from layer to layer, but overall, thereis no trend in gain or loss of either trait in the population.B.Initially, the stickleback population in the lake consisted mostly of fish with pelvic spines, but over15,000 years the population changed to fish without pelvic spines.C. Initially, very few fossil stickleback sampled had the complete pelvic phenotype, but in the following 15,000years, the frequency of this phenotype in the population increased significantly.D. The frequencies of absent and reduced pelvic phenotypes are roughly equal throughout the 15,000-yeartime span studied because the lake became flooded at one point, which allowed trout to enter the lake fromother areas.Correct!Your answer: B.Why?In layers 1 and 2 (the oldest layers), most fossil stickleback have a complete pelvis, which means they had pelvicspines. In layers 5 and 6 (the youngest or more recent layers), virtually none of the stickleback fossils examinedhad a complete pelvis. This means that, in this ancient lake, the frequency of stickleback with pelvic spinesdecreased over time. Show
5. Studies of living stickleback populations indicate that pelvic spines are an effective defense againstlarge predatory fish such as trout. What can we infer based on the data from Experiment 2? How were stickleback fish population changes?Pockets of sticklebacks were isolated by geologic changes at the end of the Ice Age 10,000 years ago, with each newly separated population evolving in response to local ecological conditions.
Which statement below best represents the relationship between age and position of sediment layers in the Nevada lake quarry?Which statement below best represents the relationship between age and position of sediment layers in the Nevada lake quarry? The lowest layer of sediment is the oldest.
What do you think might be an explanation for why Morvoro lake contains fish with and without pelvic spines?27. What do you think might be an explanation for why Morvoro Lake contains fish with and without pelvic spines? Answers will vary. It is possible that the population in Lake Morvoro is in the process of changing from a population of fish with mainly pelvic spines to one without pelvic spines, or vice versa.
How did stickleback bodies change as they adapted to life in Postglacial lakes?[CARROLL:] Stickleback bodies changed in many ways as they adapted to life in post- glacial lakes. They got smaller, their coloring changed, and most strikingly, even their skeletons changed.
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Which statement best describes what happened to the stickleback population in the ancient lake that is now the Truckee formation?
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