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is the number of possible phenotypes minus 1. Conclusion: I learned how to count tiny pieces of corn and most importantly how to use chi square values. Procedure: On two monohybrid corn, count the number of purple and yellow kernels and the smooth and shrunken kernels. Our chi square value was 0.849478749 means that it was a “good fit” and supports our hypothesis. Shrunken (B), Yellow and Smooth (C), Yellow and Shrunken (D). So, I should multiply the total 3 different times with 9/16, 3/16, and 1/16 to get my expected results. What genetic cross will give you this ratio? The χ 2 statistic is used in genetics to illustrate if there are deviations from the expected outcomes of the alleles in a population. All analysis question answers and a completed lab worksheet can be found in the file that is attached at the beginning of this blog There are four grain phenotypes in the ear. Explain Corn can be purchased from biological supply companies or through Amazon. Change ), You are commenting using your Facebook account. Use chi square analysis to see of the results fit the 9:3:3:1 ratio. The expected outcome from this Punnett Square shows a 9:3:3:1 ratio, so we can use the chi square analysis to see if the results are a good fit for the expected results. 4. The Chi-Square Test. ( Log Out /  Read all of Chapter 12 in the text book. CORN GENETICS CHI SQUARE ANALYSIS Name_____ Monohybrid Cross 1. In your case, 4 - 1 = 3. Objective: Use a chi square analysis to support your hypothesis. This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. These numbers are entered in Columns 1 and 2 of the . Problem: A large ear of corn has a total of 433 grains, including 271 Purple & starchy, 73 Purple & sweet, 63 Yellow & starchy, and 26 Yellow & sweet. Name:______________________________________________, Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. 2. Hypothesis: The (the second part of the lab) corn is a dihybrid cross of two monohybrids. Objective: To observe phenotypes and use chi square analysis to determine if results are of good fit. ( Log Out /  CORN GENETICS CHI SQUARE ANALYSIS KEY Original Document: Corn Genetics and Chi Square Analysis 7/30/2015 Chi Square Analysis Answer Key (Corn Genetics) The final value is 1.0303. So, we will just go with the standard 9:3:3:1 ratio and formula observed value minus expected value all squared and divided by the expected value. It places around the 90% mark, so it’s a very good fit for the results. Create a free website or blog at WordPress.com. Attach a separate sheet if necessary. All analysis question answers and a completed lab worksheet can be found in the file that is attached at the beginning of this blog lab report. Shannan Muskopf May 28, 2016. That means that my results were in a pretty good fit with the expected data. 2. prediction by performing chi-square analysis. The second part: on one dihybrid corn, count the number of each possible kernel type. Results #2: This is the second part of the lab with one dihybrid cross corn. Create a punnett square or use a mathematical system to determine the phenotype ratio. Change ), You are commenting using your Google account. Corn Genetics Chi Square Analysis Last updated; Save as PDF Page ID 19919; Contributed by Shannan Muskopf; High School Biology Instructor at Granite City School District; Sourced from Biology Corner; Dihybrid Cross. of each in your five rows on the ear of corn. To determine if the deviations from your observed The activity does not require growing the corn, so it can be completed … It could just be bad luck, or there is something happening with the gene. Corn Genetics: Chi Square Analysis Data Sheet Chi Square Analysis of Corn Cross #1 What ratio is evident in the data? Did you obtain a 9:3:3:1 Corn Genetics Lab. First, find the expected numbers of each ratio. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. We will now consider for the coloration and texture of the corn kernels like the one show below. Your degrees of freedom (df) Objective: To observe phenotypes and use chi square analysis to determine if results are of good fit. 5. Here are two pictures of the corn with markings that show the count of each type of corn, two monohybrid corn, one for color, one for texture: Analysis: It seems that the dominant phenotypes are the purple and smooth kernels. Question: Corn Genetics Results And Analysis Name Section Note: Include All Of Your Math For The Chi Square Calculations And Your Data From Tables 1, 2 And 3. It seems that the final value was closest to 1.42, which is at a 70% chance probability that the results happened through chance. ( Log Out /  There are four grain phenotypes in the ear. parental generation was PpSs x PpSs? Photos can be substituted: see Corn Genetics Gallery. So, the expected % of purple to yellow should be 75% to 25% or 3:1 ratio. Analysis #2: It seems that the results reflect a perfect heterozygous dihybrid cross as shown below. Corn Genetics Results and Analysis Name Section Note: Include all of your math for the chi square calculations and your data from Tables 1, 2 and 3. So, it’s a good fit. Problem: A large ear of corn has a total of 433 grains, including 271 Purple & starchy, 73 Purple & sweet, 63 Yellow & starchy, and 26 Yellow & sweet. ratio? Find Our chi square value was 0.849478749 means that it was a “good fit” and supports our hypothesis. Mendelian Genetics and Chi Square Analysis This lab was written by David J. Grisé and R. Deborah Overath Pre lab assignment. Purpose. chi square value is a good fit with your data. need to use a chi square test. Count the number of purple and yellow kernels in five of the rows on your ear of corn and record the number on the chart.

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