![]() ![]() If your class covers Hardy-Weinberg equilibrium, you may wish to use another related activity, Allele and Phenotype Frequencies in Rock Pocket Mouse Populations. There was a change in the color of the landscape.ī. This activity serves to reinforce concepts of variation and natural selection presented in the BioInteractive short film The Making of the Fittest: Natural Selection and Adaptation. What environmental change gave a selective advantage for oneĪ. This activity is based on the study of fur color evolution in rock pocket mouse populations shown in the film The Making of the Fittest: Natural. Light substrate than there were light mice on the dark coloredĢ. In this activity, students collect and analyze evidence for each of the major conditions for evolution by natural selection to develop an explanation for how populations change over time. Dark fur because there were many more dark furred mice on the The dark substrate than there were dark mice on the light coloredĭ. Light fur because there were many more light furred mice on Light fur because more of the mice in both types of habitatĬ. Dark fur because more of the mice in both types of habitatī. We consider comparative overall fitness for the entire area, whichįur color seems to have the greatest overall selective advantage,Ī. Shows that there are more dark mice living on the dark substrateĪnd more light mice living on the light colored substrate. The numbers of each genotype of mice in the questions above In gene expression, which enzyme is responsible for transcribing the DNA sequence into mRNA by adding complementary RNA nucleotides. It's called "Natural Selection and the Rock Pocket Mouse — HHMI BioInteractive Video." Thank you.Īnswer the following questions about natural selection and evolution:ġ. Lesson The Making of the Fittest Natural Selection and Adaptation Student Handout. There is a video on YouTube that's 10 minutes long that you can watch to answer these questions if you don't understand. Students interpret molecular diagrams and build physical models of eukaryotic gene regulation. Please answer with full sentences please. This hands-on activity supports concepts covered in the film Evolving Switches, Evolving Bodies about the evolution of stickleback fish. What does this tell you about the various dark-colored rock pocket mouse populations? Scientists studying rock pocket mice noted while dark-colored mice from two different populations living hundreds of miles apart looked nearly identical, their dark color was caused by two different genes. In the case of rock pocket mice, explain the specific pressure that the mice are facing on a regular basis.Įxplain why the rock pocket mice in the dark lava environment have dark fur over their backs, heads, and legs, but have white underbellies. What is the process that maintains the differences in mouse fur color? The mice maintain their different colors in different habitats over time. How does this process occur biologically? ![]() Some people suggest that evolution is a process that occurs in other animals but not humans.SOLVED: Answer the following questions about natural selection and evolution:ĭark-colored mice first appeared in a population of light-colored rock pocket mice. Which fur color has the greatest advantage on each substrate?ħ. 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. How can the Hardy-Weinberg equation be used to show that a population is evolving?Ħ. Evolution and the Rock Pocket Mouse (HHMI) This worksheet was modified from the HHMI Activity on color variation in the rock pocket mouse. ![]() Different mutations in two different genes cannot generate the same phenotype. Dark fur color evolved independently on each of these lava flows. There are at least two genes involved in creating dark-colored mouse fur. How does this percentage compare to the percentages observed using the Hardy-Weinberg equation?ĥ. Dark fur color evolved only once in rock pocket mice. How many of the offspring are expected to be DD_ Dd _ dd_ Show a punnett square of two heterozygous mice crossed. ![]() (Show work!) p 2 + 2pq + q 2 = 1 and p + q = 1Ĥ. Use the Hardy-Weinberg equation, complete the table. Calculate the frequency of light colored mice and dark colored mice found on dark substrates.ģ. Calculate the frequency of light colored mice and dark colored mice found on light substrates.įrequency = number of mice of one color / total number of mice on that substrateįrequency of light colored mice = _ | Frequence of dark colored mice _Ģ. The data is summarized in the table below.ġ. They recorded substrate color and coat-color frequencies for six locations. Nachman and his colleagues collected rock pocket mice across 35 kilometers of Arizona Sonoran Desert, which include both dark, rocky lava patches and light, rocky granite areas. ![]()
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