This resource is explicitly designed to build towards this science and engineering practice.Ĭomments about Including the Science and Engineering Practice Throughout the activity, students should work with a partner or in small groups and be encouraged to share their thinking as they make decisions about re-ordering their illustrations, graphing the data, and answering the questions. To get a sense of their initial thinking, students should not skip the step of an initial ordering the rock pocket mice illustrations before they watch the short film. To engage student interest in the lesson, teachers should raise the question of how there came to be two different populations of pocket mice (light/dark). Before starting the activity, it is helpful if the teacher familiarizes students with the rock pocket mouse and its habitat. Based on this evidence, students arrange the four illustrations in a sequence from oldest to most recent, and make an argument for how natural selection leads to a change in fur color in the populations of rock pocket mice over time. As students return to the four illustrations after watching the video, they analyze the illustrations by counting and graphing the color distribution of rock pocket mice at the two locations (light/dark). Watching the short film, students learn about the changes of rock pocket mouse populations, and that the environment contributes towards determining whether or not randomly arising mutations in fur color are advantageous, neutral, or deleterious. This resource is explicitly designed to build towards this performance expectation.Ĭomments about Including the Performance ExpectationĪt the beginning of the lesson, students place four illustrations showing different numbers of light and dark colored rock pocket mice at two locations (light/dark substrate) in sequence from oldest to most recent. The series also has two animations which will help to reinforce the concept. The film is also available as an interactive video with embedded questions, which test students’ understanding as they watch the film. This ten minute film shows adaptive changes in rock pocket mouse populations, demonstrating the process of natural selection and can be accessed at. This is one of several classroom activities, focusing on related topics and varying in complexity, built around the short film. Based on this evidence, and what they learn about variation and natural selection in the accompanying short film, students use this evidence to explain the change in the rock pocket mouse populations on the lava flow (dark substrate) over time. And in 2000, the Center, Endangered Habitats League, and the National Resources Defense Council petitioned the Service to map out and protect critical habitat areas for the pocket mouse.This activity provides an introduction to natural selection and the role of genetic variation by asking students to analyze illustrations of rock pocket mouse populations (dark/light fur) on different color substrates in the Sonoran Desert (light/dark) over time. Marines persisted with construction activities in known Pacific pocket mouse habitat, the Center gave notice of intent to sue Camp Pendleton unless the Marines first consulted with Fish and Wildlife. The Center is working to secure this habitat. Such twisted reasoning continues to hold sway currently, the Pacific pocket mouse still doesn't have its much-needed critical habitat. The agency maintained that determining to do so would not be “prudent” because a critical habitat designation would only further threaten the species by identifying and publishing the location of the sole remaining Pacific pocket mouse population. But when the Service listed the Pacific pocket mouse, the agency declined to designate any critical habitat. Fish and Wildlife Service, then was fully protected under the Endangered Species Act in 1994. It initially received an emergency listing from the U.S. Pacific pocket mice were feared extinct for nearly 20 years before the species was “rediscovered” in 1993. Without sufficient habitat, the Pacific pocket mouse is left with nowhere to hide during the hard winters. Currently, habitat destruction due to urban expansion, road construction and agriculture poses the greatest threat to this critically imperiled mouse. But if adequate food supplies are available, the mouse will remain active during winter. In winter, if environmental factors are unfavorable, the Pacific pocket mouse may hibernate underground until spring brings better conditions.
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