![]() ![]() Mutations that increase fitness of an organism usually increase in frequency in a population. KEY CONCEPTS The environment contributes to determining whether a mutation is advantageous, deleterious, or neutral. located on mouse chromosome 16 (rock pocket mice have n23 just like humans). you may wish to use another related activity, Allele and Phenotype Frequencies in Rock Pocket Mouse Populations. Throughout the activity, students learn concepts such as fitness, natural selection, mutation, and phenotype. controlled by the products of several genes, including the Mc1r gene. ![]() Students then watch the HHMI Video on pocket mice and answer discussion questions. ![]() Students also graph the color differences at each location to show how the dark variation increased over time in response to an environmental change. (Cards can be printed and laminated for multiple uses.) Students collect data on the number of mice phenotypes in each location and develop a hypothesis about the order of the cards. Its impact on science, however, has been. A typical rock pocket mouse is 172 millimeters long from its nose to the end of its tail, which is shorter than an average pencil. The tiny rock pocket mouse weighs just 15 grams, about as much as a handful of paper clips. Students look at cards showing light and dark mice on different substrates. ALLELE AND PHENOTYPE FREQUENCIES IN ROCK POCKET MOUSE POPULATIONS INTRODUCTION. It has been simplified from the original activity so that it is suitable for beginner biology students. This worksheet was modified from the HHMI Activity on color variation in the rock pocket mouse. ![]()
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