The Making of the Fittest Natural Selection and Adaptation LESSON STUDENT HANDOU
ID: 300992 • Letter: T
Question
The Making of the Fittest Natural Selection and Adaptation LESSON STUDENT HANDOUT PART 2: APPLYING HARDY-WEINBERG TO ROCK POCKET MOUSE FIELD DATA Dr. Nachman and his colleagues collected rock pocket mice across 35 kilometers of the Arizona Sonoran Desert, which included both dark, rocky lava outcrops and light, rocky, granite areas. They recorded substrate color and coat-color frequencies for each location. Each site was separated from any of the others by at least eight kilometers. The researchers trapped a total of 225 mice. Their data are summarized below. Field Data Summary Total?of mrom derV-Serfotce54 Collecting Site Substrate Color Number of Mice Phenotype Light Light Dark Dark Dark Light 85 80 45 42 34 43 Source of data: Hoekstra, Hopi E, Kristen E. Drumm, and Michael W. Nachman. "Ecological Genetics of Adaptive Color Polymorphism in Pocket Mice: Geographic Variation in Selected and Neutral Genes."Evolution 58, no.6 (2004): 1329-1344 QUESTIONS 1. Calculate the overall frequencies of light-colored mice and dark-colored mice caught on light-colored substrates frequency number of mice of one color/total number of mice miceFrequency of dark-colored mice Frequency of light-colored 2. Calculate the overall frequencies of light-colored mice and dark-colored mice caught on dark-colored substrates frequency- number of mice of one color/total number of mice Frequency of dark-colored mice Frequency of light-colored mice 3. Using the Hardy-Weinberg equation and data from the table above, determine the number of mice with the DD and Dd genotypes on the light,rocky, granite substrate. Frequency of mice with the dd genotype on light-colored substrate Frequency of mice with the DD Frequency of mice with the Dd genotype on light-colored substrate genotype on light-colored substrate 4. Using the Hardy-Weinberg equation and data from the table above, determine the number of mice with the 00 and Dd genotypes on the dark, rocky lava substrate Frequency of mice with the dd genotype on dark-colored substrate Frequency of mice with the DD genotype on dark-colored substrate Frequency of mice with the Dd genotype on dark-colored substrate Allele and Phenatype Frequencies in Rack Pocket Mouse Populations Page 4 of s HHMIExplanation / Answer
Answer 1
Frequency of light-colored mice = 120/168 = 71%;
Frequency of dark-colored mice = 48/168 = 29%
Answer 2
Frequency of light-colored mice = 3/57 = 5%;
Frequency of dark-colored mice = 54/57 = 95%
Answer 3
Frequency of mice with the dd genotype on light-colored substrate = 71%
Frequency of mice with the DD genotype on light-colored substrate = 3%
Frequency of mice with the Dd genotype on light-colored substrate = 26%
Answer 4
Frequency of mice with the dd genotype on dark-colored substrate = 5%
Frequency of mice with the DD genotype on dark-colored substrate = 61%
Frequency of mice with the Dd genotype on dark-colored substrate = 34%
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