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MERLOT II


    

Learning Exercise


Material: FlyLab
Submitted by: Jeff Bell on Sep 04, 2000
Date Last Modified: Sep 04, 2000
Title: FlyLab assignment #3 grading rubric
Description: This rubric describes the grading criteria for trihybrid mapping problems.
Type of Task: Core activity, Student-centered, Team, Unsupervised
Time Required 2 hours
Topics: Linkage, mapping, trihybrid crosses
Course: Genetics
Audience: College Upper Div Major
Categories:
Text of Learning Exercise:

Virtual FlyLab Experiments Set III,

Problems 1 and 2: Scoring Rubric



(changes from VF II are in bold)

















Exemplary Report: 10 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 re jects all hypotheses not supported
    by the evidence and proposes new hypotheses.

  • Crosses involving all three traits
    simultaneously are used and the student shows an
    understanding of independent assortment by
    correctly predicting the results if independentassortment 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


  • Gene order, linkage distances and any
    interference can be correctly calculated


  • 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: 8 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 all three 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


  • Gene order, linkage distances and any
    interference can be correctly calculated


  • 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: 6 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 all three 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 holdstudent 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


  • 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: 4 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

  • Attempts to map genes but makes frequent
    errors



Unable to Begin Effectively: 2 pt.


A poor report willhave 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

  • Can not correctly map genes


No Attempt: 0 pts.



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