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Developing an Explanation for Mouse Fur Color Questions

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Developing an Explanation for Mouse Fur Color Activity Student Handout INTRODUCTION Rock pocket mice are interesting in many ways. They make a living in the intense heat of the desert. They also come in different fur colors, from tan to black. Scientists have a good understanding of what causes fur color in individual mice. The amount, type, and distribution of a pigment molecule called melanin gives fur its color. But why are almost all the mice in some populations black and those in other populations mostly tan? What determines these patterns? The American Southwest is a fantastic place to study rock pocket mice with different coat colors. Lava flows created patches of dark rock among the surrounding light-colored sand. Researchers noticed that black rock pocket mice were more common on the dark lava flows, whereas the tan rock pocket mice were more common on the light-colored sand. They suggested that these patterns could be explained by evolution by natural selection. But what is the evidence for this claim? MATERIALS x Evolution by Natural Selection Explanation Table x Transcript from the short film The Making of the Fittest: Natural Selection and Adaptation x Additional Evidence for an Explanation handout PROCEDURE 1. Begin watching the short film The Making of the Fittest: Natural Selection and Adaptation up to the 2:37 time mark. Pause the video when Dr. Nachman says, “Almost all of them.” 2. On your own, write your best answers to the following questions. a. ...
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Tags: NATURAL SELECTION pigment molecule rock pocket mice additional evidence mouse populations

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ABIZ 2620 Da Nang University Human Resources in Farm Questions

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University of Illinois at Chicago Southern and Western Blot Samples Questions

Use this information to match the list of probes to the 3 samples below:You have isolated several DNA sequences from a var ...

University of Illinois at Chicago Southern and Western Blot Samples Questions

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University of Illinois at Chicago Southern and Western Blot Samples Questions

Use this information to match the list of probes to the 3 samples below:You have isolated several DNA sequences from a var ...

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Use this information to match the list of probes to the 3 samples below:You have isolated several DNA sequences from a variety of mouse tissues. You have labeled each one of them with a radioisotope and will use them as probes on blots of several DNA and RNA samples. Below are a list of all the probes you generated (probes A through E) and a list of all the DNA and RNA samples that you will analyze (Samples 1 through 3)Beside each sample, write the letters corresponding to all the probes that will bind to a complementary sequence in that sample. These responses are graded all or nothing!List of probesProbe A: promoter sequence of a gene that is only expressed in the nervous systemProbe B: promoter sequence of one of the genes encoding a ubiquitously expressed histone proteinProbe C: coding sequence of a gene that is only expressed in the nervous systemProbe D: coding sequence of one of the genes encoding a ubiquitously expressed histone proteinProbe E: intron of a gene that is only expressed in the nervous systemList of samplesSample 1: Southern blot of genomic DNA extracted from adult mouse cardiac muscle system cellsSample 2: Northern blot of mRNA extracted from adult mouse nervous system cellsSample 3: Northern blot of mRNA extracted from adult mouse cardiac muscle cells

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CRISPR-Cas9 (often shortened to “CRISPR”) is a biotechnology tool that can be used to edit the DNA in cells and organ ...

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