![]() ![]() Which mouse would Biologists consider the fittest?įITNESS BY DEFINITION IS THE ABILITY TO SURVIVE, AND GENERATE OFFSPRING THAT WILL REACH SEXUAL MATURITY AND REPRODUCE AGAIN! SO, THE FITTEST MOUSE IS THE TAN MOUSE BECAUSE IT LIVED THE LONGEST, AND PRODUCED THE LARGEST SIZE OFFSPRING. Some flesh-eating mammals also prey on them sometimes - think weasels and coyotes. The sidewinder (Crotalus cerastes), also known as the horned rattlesnake, competes for a tasty bite of mouse with the common barn owl (Tyto alba) and great horned owl (Bubo virginianus), all of which are major predators of pocket mice. For example, if there are two alleles present in a population for a particular trait and one allele is 10% more likely to survive than the other allele, then the selection coefficient for that alliele is 0.1 investigat new term, selection coefficient.FITNESS BY DEFINITION IS THE ABILITY TO SURVIVE, AND GENERATE OFFSPRING THAT WILL REACH SEXUAL MATURITY AND REPRODUCE AGAIN! SO, THE FITTEST MOUSE IS THE TAN MOUSE BECAUSE IT LIVED THE LONGEST, AND PRODUCED THE LARGEST SIZE OFFSPRING. You can also think of it as the relative selection advantage of a specific allele. To do this, it is necessary to introduce a or disadvantage of a genotype with respect to survival and reproductive success. To determine if the rock pocket mouse population is evolving, explain why it is necessary to collect fur color frequency data over a period of many years PART 3: HARDY-WEINBERG EXTENDED We evolving. How does this study support the concept that natural selection is not random? mice were collected from four different, widely separated areas of dark lava rock observed no dark-colored mice from the from the Arizona population. No McIr mutations were associated with dark fur color in the New Mexico populations These findi suggest that adaptive dark coloration has occurred at least twice in the rock pocket mouse and that these similar phenotypic changes have different genetic bases. However, the three New Mexico locations were slightly darker than the dark-colored mic gene was sequenced in all 76 of the mice collected The mutations responsible for the dark fur color in the Arizona mice were absent from the three different New Mexico mice. Nachman and colleagues significant differences in the color of the rocks in the four locations sampled. According to the film, what environmental change gave a selective advantage for one coat color over another In a separate study, 76 rock pocket One collecting site was in Arizona. Which fur color seems to have the greatest overall selective advantage? Use data collected from both dark-colored and light-colored substrates to support your answer 6. Using the Hardy-Weinberg equation and data from the table above, determine the number of mice with the DD 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 Phenotype Frequencies in Rock Pocket Mouse Populations HHMI OWARD HUGHES M of 6 hris The Making of the Fittest: Natural Selection and Adaptation LESSON STUDENT HANDOUT S. Frequency of mice with the dd genotype on light-colored substrate Frequency of mice with the DD genotype on light-colored substrate Frequency of mice with the Dd genotype on light-colored substrate 4. ![]() 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. 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 light-colored mice Frequency of dark-colored mice 3. Calculate the overall frequencies of light-colored mice and dark colored frequency number of mice of one color/total number of mice mice caught on light-colored substrates Frequency of light-colored miceFrequency of dark-colored mice 2. Ecological dG lymorphism in Pocket Mice: Geographic Variation in Selected and Neutral Genes. Their data are summarized below Field Data Summary 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. The researchers trapped a total of 225 mice. Each site was separated from any of the others by at least eight kilometers. They recorded substrate color and coat color frequencies for each location. 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. The Making of the Fittest: Natural Selection and Adaptation LESSON STUDENT HANDOUT PART 2: APPLYING HARDY.WEİNBERG TO ROCK POCKET MOUSE FIELD DATA Dr. ![]()
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