Virtual FlyLab Experiments Set III, Problem 3: Scoring Rubric (changes from VF III, problem 2 are in bold) Exemplary Report: 15 pts. An exemplary report will have the following characteristics All crosses are diagramed both phenotypically and genotypically with clear symbols that reflect the hypothesized inheritance pattern. After each cross the results are analyzed and there is a clear statement of the students current hypothesis. Predictions based on the hypothesis are made for the each cross before doing the cross and the crosses chosen are appropriate for testing the current hypothesis. Hypotheses are tested statistically using the chi-square test in an appropriate manner Chi-square results are understood and are correctly interpreted Student rejects all hypotheses not supported by the evidence and proposes new hypotheses. Crosses involving multiple traits simultaneously are used and the student shows an understanding of independent assortment by correctly predicting the results if independent assortment is true If independent assortment does not hold student can tell when linkage between traits might be involved, and knows how to test for this Student can correctly and simply determine which genes are members of the same linkage group Gene order, linkage distances and any interference can be correctly calculated for all genes that are members of the same linkage group There is a conclusion that correctly explains the inheritance pattern for the traits, with supporting evidence, or a conclusion that clearly describes why all reasonable hypotheses can not explain the results, with supporting evidence. If all known hypotheses are inadequate, student shows some creativity in coming up with at least one alternative hypotheses to test. The report shows a clear understanding of the genetics covered up to this point in class that is applicable to this problem, is neat and well organized, with no superfluous or unexplained crosses. Satisfactory Report: 12 pts. A satisfactory report will have the following characteristics All crosses are diagramed both phenotypically and genotypically with clear symbols that reflect the hypothesized inheritance pattern. After each cross the results are analyzed and there is a clear statement of the students current hypothesis. Predictions based on the hypothesis are made for the each cross before doing the cross and the crosses chosen are appropriate for testing the current hypothesis. Hypotheses are tested statistically using the chi-square test in an appropriate manner Chi-square results are understood and are correctly interpreted Student rejects all hypotheses not supported by the evidence and proposes new hypotheses. Crosses involving multiple traits simultaneously are used and the student shows an understanding of independent assortment by correctly predicting the results if independent assortment is true If independent assortment does not hold student can tell when linkage between traits might be involved, and knows how to test for this Student can correctly determine which genes are members of the same linkage group Gene order, linkage distances and any interference can be calculated for all genes that are members of the same linkage group, but some errors are made There is a conclusion that correctly explains the inheritance pattern for the trait, with supporting evidence, or a conclusion that clearly describes why all reasonable hypotheses can not explain the results, with supporting evidence. The report is not always clearly written and has inappropriate crosses or crosses that are not well explained, but does include the appropriate crosses and does explain what is going on. Serious Flaws But Nearly Satisfactory: 9 pts. A nearly satisfactory report will have the following characteristics All crosses are diagramed both phenotypically and genotypically with clear symbols that reflect the hypothesized inheritance pattern. Does not always have predictions for what will happen in a cross and does not discuss the results from all crosses. Has at least tested the most likely hypotheses and shows a basic knowledge of the appropriate genetics. Hypotheses are tested statistically using the chi-square test but the test may not always be applied correctly Crosses involving multiple traits simultaneously are used and the student shows an understanding of independent assortment by correctly predicting the results if independent assortment is true If independent assortment does not hold student can tell when linkage between traits might be involved, and knows how to test for this, but may not be able to correctly determine order or distances Distances and order for some genes is correctly determined but student is easily confused by traits with unusual inheritance and sometimes includes unlinked genes by mistake Has a conclusion with supporting evidence and has clearly tried to solve the problem, but may not have a complete solution. Begins, But Fails to complete Problem: 6 pts. An incomplete report will have the following characteristics All crosses are diagramed both phenotypically and genotypically with clear symbols that reflect the hypothesized inheritance pattern. Can not make reasonable predictions of the results of a cross, especially when more than one trait is involved, and can not always tell whether a cross supports or refutes a hypotheses but does know what some of the hypotheses should be. Attempts to do the chi-square but clearly does not understand how to properly use or interpret the chi-square test Does not know how to tell which genes are linked and has many errors in gene map Unable to Begin Effectively: 3 pt. A poor report will have the following characteristics Can not properly distinguish between phenotype and genotype Can not diagram cross or make reasonable predictions based on a Mendelian hypothesis. Can not set up chi-square Does not understand independent assortment Does not understand linkage or linkage groups Can not determine gene order No Attempt: 0 pts. Bell CSU Chico Library This document is copyright of Jeff Bell Last Update: Monday, August 21, 2000