BIOL2262 Assignment 1 rubric
BIOL2262 Assignment 1 rubric
BIOL2262 Assignment 1 rubric
Criteria Ratings Pts
This criterion is linked to a learning outcomeCriteria 1
Predicting experimental results from dihybrid genetic crosses (CLO1) demonstrates evidence of problem solving and critical thinking in genetics (CLO1).20 points 20Pts
Outstanding
There is strong and convincing evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome. Correct nomenclature was used to write out the genotypes and phenotypes in the P, F1 and F2 generations for the dihybrid self and testcross in questions 1a and b. Phenotypic ratios were stated. 15Pts
Advanced
There is strong evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome. The genotypes and phenotypes in the P, F1 and F2 generations for the dihybrid self and testcross in questions 1a and b contained minor errors in nomenclature or minor omissions. 12.5Pts
Developed
There is reasonable evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome. The genotypes and phenotypes in the P, F1 and F2 generations for the dihybrid self and testcross in questions 1a and b contained >1 minor errors in nomenclature or omissions. 10Pts
Competent
There is limited evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome. The genotypes and phenotypes in the P, F1 and F2 generations for the dihybrid self and testcross in questions 1a and b contained major errors in nomenclature and major omissions. 0Pts
Not Satisfactory
There is insufficient evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome.
20pts
This criterion is linked to a learning outcomeCriteria 2
Interpreting experimental data using a Chi-Square test (CLO1) demonstrates a) an understanding of genetics and b) an ability to analyse and interpret experimental results of a genetic cross in a scientifically meaningful way (CLO2).20 points 20Pts
Outstanding
The interpretation of the experimental data shows an advanced and thorough understanding of genetics and a very high level and significant capability to analyse and interpret experimental results which are unambiguous and strong in validity and have scientific accuracy and meaning. The Chi-square test was correctly performed with a clearly stated hypothesis, degrees of freedom, calculations, p value and conclusion (question 1c). 15Pts
Advanced
The interpretation of the experimental data shows a sound and reasonably comprehensive understanding of genetics and a high level ability to analyse and interpret experimental results which are strong in validity and scientific accuracy and meaning. The Chi-square test was correctly performed but did not contain one of: a clearly stated hypothesis, degrees of freedom, calculations, p value, or conclusion or contained a minor error (question 1c). 12.5Pts
Developed
The interpretation of the experimental data shows a good understanding of genetics and an ability to analyse and interpret experimental results which are clear and scientifically useful. The Chi-square test was correctly performed but did not contain two of: a clearly stated hypothesis, degrees of freedom, calculations, p value or conclusion (question 1c) or the Chi-square value was not correct as the wrong ratio was used. 10Pts
Competent
The interpretation of the experimental data shows an adequate understanding of genetics and a limited capability in interpreting and analysing experimental results which may have some scientific application. The Chi-square test was correctly performed but did not contain three of: a clearly stated hypothesis, degrees of freedom, calculations, p value or conclusion or the Chi-Square test was not correctly performed. (question 1c). 0Pts
Not Satisfactory
The interpretation of the experimental data shows an inadequate understanding of genetics and an unsatisfactory capability in interpreting and analysing experimental results. No scientific conclusions can be drawn.
20pts
This criterion is linked to a learning outcomeCriteria 3
Predicting experimental results from a trihybrid genetic cross (CLO1) demonstrates evidence of problem solving and critical thinking in genetics (CLO1).30 points 30Pts
Outstanding
There is strong and convincing evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome. Correct nomenclature was used to write out the genotypes and phenotypes in the P, F1 and F2 generations for the trihybrid cross in question 2a. 22.5Pts
Advanced
There is strong evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome. The genotypes and phenotypes in the P, F1 and F2 generations for the trihybrid cross in question 2a contained a minor error in nomenclature or a minor omission. 18.75Pts
Developed
There is reasonable evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome. The genotypes and phenotypes in the P, F1 and F2 generations for the trihybrid cross in question 2b contained minor errors in nomenclature or a major omission. 15Pts
Competent
There is limited evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome. The genotypes and phenotypes in the P, F1 and F2 generations for the trihybrid cross in question contained errors in nomenclature or >1 major omissions. 0Pts
Not Satisfactory
There is insufficient evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome.
30pts
This criterion is linked to a learning outcomeCriteria 4
Interpreting experimental data of a trihybrid cross (CLO1) demonstrates a) an understanding of genetics and b) an ability to analyse and interpret experimental results of a genetic cross in a scientifically meaningful way (CLO2).30 points 30Pts
Outstanding
The interpretation of the experimental data shows an advanced and thorough understanding of genetics and a very high level and significant capability to analyse and interpret experimental results which are unambiguous and strong in validity and have scientific accuracy and meaning. The F2 phenotypic classes (parental, recombinant or double recombinant) were correctly identified for each allelic pair in the question 2b genetic cross. 22.5Pts
Advanced
The interpretation of the experimental data shows a sound and reasonably comprehensive understanding of genetics and a high level ability to analyse and interpret experimental results which are strong in validity and scientific accuracy and meaning. The F2 phenotypic classes (parental, recombinant or double recombinant) were identified for each allelic pair in the question 2b genetic cross with a minor error. 18.75Pts
Developed
The interpretation of the experimental data shows a good understanding of genetics and an ability to analyse and interpret experimental results which are clear and scientifically useful. Two of the F2 phenotypic classes (parental, recombinant or double recombinant) were correctly identified for each allelic pair in the question 2b genetic cross. 15Pts
Competent
The interpretation of the experimental data shows an adequate understanding of genetics and a limited capability in interpreting and analysing experimental results which may have some scientific application. One of the F2 phenotypic classes (parental, recombinant or double recombinant) were correctly identified for each allelic pair in the question 2b genetic cross or an attempt was made to identify the the phenotypic classses but they were not identified for each gene pair as requested in the question. 0Pts
Not Satisfactory
The interpretation of the experimental data shows an inadequate understanding of genetics and an unsatisfactory capability in interpreting and analysing experimental results. No scientific conclusions can be drawn.
30pts
This criterion is linked to a learning outcomeCriteria 5
Generation of a recombination map from the experimental data (CLO1) demonstrates an understanding of genetics and the ability to communicate this in a scientifically meaningful way (CLO2) while adhering to conventions appropriate for scientific audiences (CLO3).40 points 40Pts
Outstanding
Generation of a recombination map from the experimental data shows an advanced and thorough understanding of genetics and there is strong and convincing evidence of an ability to think critically and problem solve. The map distances were correctly calculated, the gene order of the loci were identified and the recombination map was generated correctly. Units and all calculations were shown. 30Pts
Advanced
Generation of a recombination map from the experimental data shows a sound and reasonably comprehensive understanding of genetics and there is strong evidence of an ability to think critically and problem solve. The answer to question 2c showed one of the following: no calculations, incorrect calculations, no map, no units or the incorrect order of gene loci. 25Pts
Developed
Generation of a recombination map from the experimental data shows a good understanding of genetics and there is reasonable evidence of an ability to think critically and problem solve. The answer to question 2c showed two of the following: no calculations, incorrect calculations, no map, no units or the incorrect order of gene loci. 20Pts
Competent
Generation of a recombination map from the experimental data shows an adequate understanding of genetics and there is limited evidence of an ability to think critically and problem solve. The answer to question 2c showed three of the following: no calculations, incorrect calculations, no map, no units or the incorrect order of gene loci. 0Pts
Not Satisfactory
Generation of a recombination map from the experimental data shows an inadequate understanding of genetics and there is insufficient evidence of an ability to think critically and problem solve.
40pts
This criterion is linked to a learning outcomeCriteria 6
Predicting experimental results from a genetic cross (CLO1) demonstrates evidence of problem solving and critical thinking in genetics (CLO1). 30 points 30Pts
Outstanding
There is strong and convincing evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome. The number of progeny with the specified phenotype was correctly identified showing all calculations in question 3 22.5Pts
Advanced
There is strong evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome. The number of progeny with the specified phenotype was correctly identified showing all calculations in question 3 but contained a minor error. 18.75Pts
Developed
There is reasonable evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome. The number of progeny with the specified phenotype was not correctly identified but the problem solving approach applied was correct and all calculations were shown. 15Pts
Competent
There is limited evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome. The number of progeny with the specified phenotype was correctly identified but calculations were not shown. 0Pts
Not Satisfactory
There is insufficient evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome.
30pts
This criterion is linked to a learning outcomeCriteria 7
Predicting experimental results from a genetic cross (CLO1) using the product rule demonstrates evidence of problem solving and critical thinking in genetics (CLO1).30 points 30Pts
Outstanding
There is strong and convincing evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome. The number of progeny with the specified genotype was correctly identified showing all calculations in question 4 22.5Pts
Advanced
There is strong evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome. The calculations of the number of progeny with the specified genotype in question 4 contained a minor error. 18.75Pts
Developed
There is reasonable evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome. The calculations of the number of progeny with the specified genotype in question 4 contained a major error. 15Pts
Competent
There is limited evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome. The calculations of the number of progeny with the specified genotype in question 4 contained major errors or the number was correctly identified but calculations were not shown. 0Pts
Not Satisfactory
There is insufficient evidence of an ability to think critically and problem solve when executing multifaceted scientific tasks which have a clear outcome.
30pts
Total points
A geneticist is aiming to obtain a variety of corn that has particular attributes. In order to understand the inheritance of particular traits, they perform a series of genetic crosses as described below. Use the results to answer the questions.
PART A
A cross of two pure-breeding corn plants was performed where one parent was wildtype (straight stem with long tassels) and the other parent was a mutant (bent stem and short tassels). The F1 dihybrid offspring had straight stems with long tassels.
Use the following gene symbols:
St+: straight stem
st: bent stem
L+: long tassels
l: short tassels
Q1a) Use a punnett square to determine the expected genotypes and phenotypes for a F1 dihybrid testcross. State the phenotypic ratio expected in the F2. Write out the full genetic cross including the genotypes and phenotypes of the P, F1 and F2 generations using correct genetic nomenclature.
Q1b) Use a punnett square to determine the expected genotypes and phenotypes for a F1 self cross (i.e. F1 offspring crossed to another F1 offspring). State the phenotypic ratio expected in the F2. Write out the full genetic cross including the genotypes and phenotypes of the P, F1 and F2 using correct genetic nomenclature.
Q1c) The following 400 progeny were obtained from the F1 self cross (b):
Straight stem and long tassels 216
Straight stem and short tassels 68
Bent stem and long tassels 87
Bent stem and short tassels 29
Use a Chi-square test to determine if these ratios are as expected (show hypothesis, degrees of freedom, p value, conclusion and calculations).
PART B
Two different pure-breeding lines of corn were obtained with a tester that was homozygous recessive for the three genes. The parentals shrivelled (sh/ sh . br+/ br+. f+/ f+) and brown and fine (sh +/ sh +. br / br . f/f ) were crossed. The F1 was wildtype. The F1 was testcrossed (sh/sh . br/ br. f/ f) and the following F2 progeny was obtained: 3601 shrivelled; 3713 brown and fine; 1021 brown; 865 fine and shrivelled; 453 shrivelled and brown; 333 fine; 6 wildtype; 8 shrivelled, brown and fine.
Q2a) Write out the full genetic cross including genotypes and phenotypes of the P, F1 and F2 generations using correct genetic nomenclature (eg. linked/unlinked, gene order).
Q2b) Draw a table including each of the F2 phenotypic classes and identify, for each pair of gene loci (3), the parentals, recombinants and double recombinants (like the example given in the week 3 tutorial).
Q2c) Determine the gene order of the loci, calculate the map distances between the loci and draw a recombination map (showing the position of the genetic loci and the distances between them). You must show all calculations.
PART C
Corn with the genotype wx+ sh+/ wx shis wildtype. A heterozygous plant (wx+ sh+/ wx sh) was testcrossed to a plant with waxy and shrivelled kernals (wx sh / wx sh). The genes are linked and 32 m.u.s apart. 400 progeny were obtained.
Q3) How many of these progeny would you expect to have the waxy phenotype? (and are not shrivelled). Show calculations.
PART D
Sugary kernals (su), pericarp colour (p), knotted (kn), colored plant (b) and bronze (br) are unlinked recessive genetic loci in corn. A cross of two pure-breeding plants was performed with the parents knotted and bronze (Su/Su. P/P. kn/kn . B/B . br/br) with a sugary kernel, pericarp colour and coloured plant (su/su. p/p . Kn/Kn . b/b . Br/Br). The F1 progeny were all wildtype (Su/su. P/p. Kn/kn . B/b . Br/br).
Q4) If the F1 progeny are self crossed, use the product rule (not a punnett square) to determine what proportion of the progeny will be genotype Su/Su . P/p . kn/kn, B/b . Br/br ?
