The collared lizard is a species found in the Desert Southwest. Male collared li
ID: 277503 • Letter: T
Question
The collared lizard is a species found in the Desert Southwest. Male collared lizards show considerable color variation, ranging from brightly colored to a very dull pattern. Your goal is to determine the function, if any, of male color patterns in collared lizards, using the scientific method. Your tentative explanation is that male color plays a role in attracting females for mating purposes. You predict that females will preferentially choose brightly colored males over dull-colored ones. To test this prediction, you observed the interactions of female collared lizards with their male counterparts. You selected males that were the same age and size, and that differed only in their coloration pattern. You placed equal numbers of the two types of male lizards, bright and dull, in aquariums, along with one female lizard per aquarium. Out of 350 aquariums observed, the female chose to mate with the brightly colored male 277 times, and the dull-colored male 70 times. In 3 instances, the females did not mate with either type.
1) Is it reasonable to conclude (i.e., is it supported by the data) that female collared lizards prefer more brightly colored male lizards over dull-colored males?
A) Yes, this conclusion is supported by the data.
B) No, this conclusion is not supported by the data.
C) The data do not clearly indicate a preference one way or the other.
D) None of the above choices are correct.
2) Identify the experimental group of this case study.
A) brightly colored female lizards
B) brightly colored male lizards
C) dull-colored female lizards
D) dull-colored male lizards
3) Dull-colored males were part of the ______.
A) observation group
B) control group
C) experimental group
D) predicted group
4) Which of the following is the hypothesis of this case study?
A) Male collared lizards exhibit color variation.
B) Dull males are less likely to be eaten by predators.
C) A function of male coloration is to attract females.
D) Males prefer brightly colored females.
5) "Male collared lizards show considerable color variation." This is a(n) ______.
A) hypothesis
B) conclusion
C) observation
D) result
Explanation / Answer
1. Answer: A) Yes, this conclusion is supported by the data.
2. Answer: C) brightly coloured male lizards
3. Answer: B) control group
4. Answer: D) A function of male colouration is to attract females.
5. Answer: C) observation