Lab 6 Answer Sheet: Genetics
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Name |
Course |
Date |
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BIOL 103 |
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Activity Data Code FORMTEXT
FFFFFFFF00000000140006005400650078007400340035000000000000000000000000000000000000000000000000000000
* * Note the requirements of Lab 6 have been shortened from what you see online in the TableTop Science virtual lab. You are only required to do Parts A & D of Procedure I, and Part A of Procedure II.
Procedure I
Part A – Baby bugs when parents are BB and bb
Table 1 – Enter your Baby Bug count data (numbers) from your virtual lab run.
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BB Baby Bug Count |
Bb Baby Bug Count |
bb Baby Bug Count |
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0 |
10 |
0 |
Table 2 – Calculate the percentage of each Baby Bug genotype.
Tip: Baby Bug Percentage = 100% ´ (Baby Bug Count) / (Total Number of Baby Bugs)
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BB Baby Bug Percentage |
Bb Baby Bug Percentage |
bb Baby Bug Percentage |
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Table 3 – Calculate the percentage of each Baby Bug phenotype.
Tip: Blue Rimmed Baby Bug Percentage = (BB Baby Bug Percent) + (Bb Baby Bug Percent)
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Blue Rimmed Baby Bug Percentage |
Yellow Rimmed Baby Bug Percentage |
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1. Complete the Punnett Square below when the parents are BB and bb.
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Punnett Square |
Male |
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Female |
Alleles/Genes |
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B |
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B |
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2. Describe your baby bug results from this data run in terms of genotypes: Why are there no BB baby bugs or bb baby bugs from this data run?
3. Describe your baby bug results from this data run in terms of phenotypes.
4. Using your Punnett Square from Q1, calculate the expected percentage of Blue Rimmed Baby Bugs and Yellow Rimmed Baby Bugs. Show your work. Compare the actual results you observed in your virtual lab run with the allele distribution predicted by the Punnett Square. Do they accurately correspond? Explain why or why not.
5. What evidence from this data run supports the hypothesis that the B allele is the dominant allele? Explain your reasoning.
Part D – Baby bugs when parents are Bb and Bb
Table 12 – Enter your Baby Bug counts data from each data run.
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Data Run |
BB Baby Bug Count |
Bb Baby Bug Count |
bb Baby Bug Count |
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1 |
1 |
7 |
2 |
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7 |
3 |
7 |
0 |
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3 |
3 |
6 |
1 |
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4 |
2 |
6 |
2 |
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5 |
1 |
7 |
2 |
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6 |
1 |
3 |
6 |
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7 |
4 |
4 |
2 |
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8 |
1 |
3 |
6 |
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9 |
2 |
7 |
1 |
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10 |
0 |
5 |
5 |
Table 13 – Calculate the average of each Baby Bug genotype.
Tip: BB Baby Bug Count Average = (Sum of BB Baby Bug Counts) / (Number of Data Runs)
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BB Baby Bug Count Average |
Bb Baby Bug Count Average |
bb Baby Bug Count Average |
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Table 14 – Calculate the percentage of each Baby Bug genotype.
Tip: Baby Bug Percent = 100% ´ (Baby Bug Count Average) / (Total Number of Baby Bugs)
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BB Baby Bug Percentage |
Bb Baby Bug Percentage |
bb Baby Bug Percentage |
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Table 15 – Calculate the percentage of each Baby Bug phenotype.
Tip: Blue Rimmed Baby Bug Percentage = (BB Baby Bug Percent) + (Bb Baby Bug Percent)
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Blue Rimmed Baby Bug Percentage |
Yellow Rimmed Baby Bug Percentage |
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6. Complete the Punnett Square below when the parents are Bb and Bb.
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Punnett Square |
Male |
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Female |
Alleles/Genes |
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B |
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b |
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7. Using your Punnett Square, calculate the expected percentage of Blue Rimmed Baby Bugs and Yellow Rimmed Baby Bugs. Show your work. How do your percentage table results (your actual, observed results) compare with the Punnett Square calculations? Do they accurately correspond? Explain why or why not.
Procedure II
Part A – Bug Population changes when there is a breeding preference for blue rimmed bugs.
Table 16 – Enter your final bug counts.
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BB Bug Count |
Bb Bug Count |
bb Bug Count |
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16 |
3 |
1 |
Table 17 – Calculate the percentage of each Baby Bug genotype.
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BB Bug Percentage |
Bb Bug Percentage |
bb Bug Percentage |
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Table 18 – Calculate the percentage of each Baby Bug phenotype.
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Blue Rimmed Bug Percentage |
Yellow Rimmed Bug Percentage |
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8. Describe how the bug population changed during this data run, in terms of both genotypes and phenotypes.
9. Do your results suggest anything about what the composition of this population might be at some distant point in the future? Defend your answer.
10. Calculation: Based on the initial starting population, use the Hardy-Weinberg equation to predict the future bug population phenotype composition. Show all your work. Hint: Under the Background tab, go to the Summary of Formulas Needed for Calculations section, see the example titled Using the Hardy-Weinberg Equation, then do Step 1 and Step 2 using the initial starting population for this data run.
11. Calculation: Is this population consistent with the expectations of the Hardy-Weinberg model, that is, is this population stable? Show all your work. Hint: Under the Background tab, go to the Summary of Formulas Needed for Calculations section, see the example titled Using the Hardy-Weinberg Equation, then do Step 3 and Step 4 for this data run.
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