I use the Pocket Mouse Analysis PowerPoint to guide the activity. Once the students are in their groups, I pass each group a set of images to analyze (pages 5-8 of the student materials) and give each student the Pocket Mouse Data Sheet to record their answers throughout the activity. A student's mirror is the person who sits in their seat but on the opposite side of the room. My room is set up with 4 lab tables on opposite sides of the room with an aisle separating them. My favorite grouping strategy is to use "mirror groups". To help lessen the stress of the project based nature of this course, I typically allow students to choose their groups (though I usually require that the current group is not an exact match to the prior group) so to ensure students work with different people it is important that I assign the groups for these smaller tasks. One of my goals through the year is to help students learn to work with a variety of different people. Rather than walking you through these materials, this lesson demonstrates how I implement it in my classroom. The student materials are also found in the resources. The teacher materials hold many teaching tips and the answer keys. Population evolves it will start losing the light fur gene and start exhibiting more dark fur traits.This lesson is from HHMI Biointeractive. It’s important to collect data over a period of years to observe the change in alleles. The mice thatĭid not adapt to this were killed off by predators and the darker fur mice reproduced and passed on The mice adapted to their surrounding by, over time, evolving a darker fur coat shade. This study supports the evidence that natural selection is not random because as shown in the video, Due to the length of this lab, there are no post lab questions. To determine if the rock pocket mouse population is evolving, explain why it is necessary to collectįur color frequency data over a period of many years.How does this study support the concept that natural selection is not random? Least twice in the rock pocket mouse and that these similar phenotypic changes have different geneticīases. Q=0 because you take the number of affected mice divided by the total and then square root. Mutations in the Mc1r gene change the fur color by making fur either darker in this population of This trait, depending on the fur color, can increase the chances of The null hypothesis is rejected because we got a value greater than the critical value (3). What is the value of q? Remember that light-colored fur is recessive.ġ9**.** If the frequency of p in a population is 60% (0), what is the frequency of q? If there are 12 rock pocket mice with dark-colored fur and 4 with light-colored fur in a population,.REVIEWING THE PRINCIPLES OF THE HARDY-WEINBERG THEOREM What is the genetic basis of the trait?.Survival of the mice in different environments? What specific trait did researchers study in this investigation and How does this trait affect the P P1! Y !!! !!! Xs X + X + Xs X + Y X + X + Xs X + Y F F1!! !!! !!! X + Y X + X + X + X + Y Xs X + Xs XsYĬalculate the Χ 2 and p for the F2 data above. The white eyed characteristic is sex linked because the pattern of inheritance is not the same for The null hypothesis is rejected because we got a value greater than the critical value (3) Which states that the observed results differ significantly from the predicted ones?īased on the data obtained above, is the white eyed characteristic autosomal or sex liked? Why?Ĭomplete the P1 Punnett squares that would give rise to the data above. Its important to keep the adult flies separate from the flies in the F1 generation so that they don’tīased on your calculation: Do you reject the null hypothesis and accept the alternative hypothesis, Why is it important to remove the adult flies in week 1?īased on the data shown above, is this cross monohybrid or dihybrid? The XX(female) chromosome or XY(male) chromosome What characteristic can be used to identify the sex of fruit flies.Įxperimental Set Up: Since we can do that actual experiment, we’ll use the data given by the Eggs Sperm Y ! Y Xw ! X + ! Y Xw ! Xw ! Xw ! ! X + Xw ! ! X + Xw 2:īecause males only have one X chromosome that is affected Why is the white eyed characteristic more common in males? What is the ratio of wildtype to white eyed offspring produced above? Complete the Punnett Square below to demonstrate how two wildtype flies and produce some white
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