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. Make sure, the tape is not twisted before you reattach the rubber band.Īs a last measure tighten the tape between front and back roll, then attach the cover.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. Now wind up some tape on the now empty roll and place it back into the mouse. ![]() Use a small slice of duct tape (~3mm width) and stick the tape back to the front roll. In your hands is the now free front roll with all the clumped tape garbage. We have reached the point of no return: Cut off the tape. Now unroll about 5-10 cm used tape from the front roll. Dont flip the rolls around, remove it carefully. You need to remove the rubber-band holding the front and back roll in sync. ![]() Remove the top from the mouse, this is the side that has the hole for the screw-driver. It can be pulled off and later reattached. To fully open the housing, you need to open the red nose. Take care to not paint your cloth or working table with remaining Tipp-Ex color flakes. Do not apply too much force, or the device will break. Now it can collect again and the tape will not fall off and block the roll.Ĭarefully open the device with a screwdriver. You need to empty the front roll from the used tape. After some time, the tape was no longer collected by the waste roll and only pulled from the device. This has been the same for us on all Tipp-Ex PM we have purchased.
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