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Rock pocket mouse graph5/2/2023 ![]() Be sure to state your hypothesis, as well as what type of data you will record. That is possible because mutations are random and they both end up with the same phenotype, so they will both be equally successful.ħ. CONSIDER: How would you design an experiment to test which population of dark-colored mice is more evolutionarily fit in an environment of your choice? You may want to use the above experiments as a guide. You discover that the dark-colored mice from Arizona have a different allele of this gene than the dark-colored mice from New Mexico. In the second graph, natural selection favored the black mice and kept the numbers of the white mice low.Ħ. Prior to your experiment above, you take a DNA sample from one dark-colored mouse in each population and sequence a gene known to play a role in making mice dark colored. In the first graph, it is likely that the white mice were gradually eliminated by visual predators in the process of natural selection. Be sure to include the following key words in your answer: selection (or selective), fitness (or fit), survival (or survive). In graph B, the numbers are fairly steady: there are many more black mice than there are white mice.ī)Provide an explanation for these observations. However, over the years, the population of white mice experiences a steady decline, while the numbers of black mice increase and they are then a majority. In graph A, the population of white mice is significantly higher than black mice. You monitor the populations for five years and observe the following:Ī) In one or two sentences, summarize the data presented in the graphs above. You also move 160 dark-colored mice from the New Mexico colony to the Arizona colony (Graph B). ![]() You next decide to move 160 of these newly discovered light-colored rock pocket mice from Arizona to a colony in New Mexico (Graph A) that also lives on dark-colored volcanic rock. Since there are fewer visual predators, natural selection did not favor dark-colored mice, so the light colored mice are equally fit and survive.ĥ. ![]() The similar populations despite the fat that they are living on the dark colored rock could be attributed to the relative absence of visual predators. In the graph, its shows the populations of light and dark-colored mice being nearly equal on the volcanic rock, with the numbers of dark colored mice staying nearly the same, and the population of light-colored mice rising and falling.ī) Provide one possible hypothesis that would explain the observed data. You observed the following numbers of light- and dark-colored mice on this new patch of rock:Ī) In one or two sentences, summarize the data presented in the graph. This environment does not have nearly as many visual predators as in previously studied areas in New Mexico. These mice live on a recently discovered patch of dark-colored volcanic rock. You are studying a new population of rock pocket mice in Arizona. (c) The same mutation spontaneously arose in the two different populations.Ĥ. (b) The volcanic rock caused the same mutation in each rock pocket mouse population, resulting in dark coloration. (a) The mice in the two populations evolved from the same ancestral population. Which of the following could explain this observation? The sequence you get is identical to that of the same gene in another rock pocket mouse population with dark-colored fur that live on a different patch of volcanic rock. ![]() ![]() You take a DNA sample from a member of this new population and determine the DNA sequence of a gene known to play a role in fur color. You are studying a recently discovered population of rock pocket mice with dark-colored fur that lives on volcanic rock. Natural selection is not random, as it is an external force that eliminates organisms based on those mutations.ģ. Mutations are random because any can occur at any time and like they said in the video, they can be positive, negative or neutral. Sean Carroll states that, “While mutation is random, natural selection is not.” In your own words, explain how this is possible. Is the following statement true or false? Justify your answer in one or two sentences: “The appearance of dark-colored volcanic rock caused the mutation for black fur to appear in the rock pocket mouse population.”įalse. The mutation of black fur was always there, the appearance of the volcanic rock simply made it so that natural selection eliminated more of the mice who did not have the same color fur as the rock.Ģ. ![]()
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