![]() Mouse predators are birds, which hunt by sight from above. Speciation Video When you talk about how all of todays species evolved from a. In both cases, the ventral (belly) side of the mouse is white, because there is no selection pressure for fur color in that area. Rock Pocket Mouse In this activity students examine how fur color in. ![]() Mutations are random, but survivability depends on the environment the mouse lives in. Then, use the included questions to guide your note-taking for each objective in this Focus Area. It is a different color due to a mutation in the mc1r gene. Coloration is controlled by genes, where a single mutation can result in a different color. A typical rock pocket mouse is about 170 millimeters The Sonoran Desert. Mice that live on light, sandy substrate will have lighter color. Mice that live on a dark rocky substrate are more likely to be dark in color. The variation comes from random mutations and recombination of genes during sexual reproduction. The species has adapted color variation, in order to better survive in changing habitats. The species grows to be approximately 18 cm long, with the tail equaling 10 cm of the total length. Inheritance The trait is inherited (passed from parents to offspring). The rock pocket mouse, Chaetodipus intermedius, exhibits weak rump spines (see Photo 1 and Photo 2) and has coarse fur. Students then graph the color differences at each location to show how the dark variation increased over time in response to an environmental change. The rock pocket mouse has a sandy and dark color within the population due to gene mutation proving the idea of Variation. (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. Students look at cards showing light and dark mice on different substrates. ![]() 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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