Biology 6B Laboratory Report II
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Transcript Biology 6B Laboratory Report II
Biology 22
Laboratory Report 1
Spring 2010
Analysis of Body Color Inheritance
and Genetic Mapping in Fruit Flies
Refer to pages 1-231-26 of the
lab manual for a written
description of the lab report.
Format of Laboratory Report
Title
Statement of
Hypothesis
Results
Discussion
Conclusion
Title
The title should include
• the purpose(s) of the experiment(s)
• the name of the experimental organism or
system
eg. Saccharomyces cerevisiae or
cell lysate
Statement of Hypothesis
This section should include
the hypothesis you have formulated
for the inheritance of body color in
fruit flies.
a brief rationale for the chosen
hypothesis, considering the data as a
whole. You will give a more detailed
account of your reasoning in the
discussion section.
Results
• Present your experimental data in this section.
• Report your data and calculated values in tabular
format. Sample tables are shown on pages 1-25
1-26 of the lab manual. Place a meaningful
caption above each table. Each caption needs a
title and brief description explaining the source of
the data.
• Write a brief narrative to orient the reader to the
data shown in specific tables.
Results
Body Color
Inheritance
Phenotypes of Parents and
Offspring for each Cross
Proposed Genotypes and
Genetic Ratios for each Cross
Chi-square Analysis for each
Cross
Results
Three-Point Observed Numbers of Offspring in
Testcross
Each Phenotypic Class
Gene Order and Map Distances
between the genes
Discussion
Present your interpretation of the results in this
section.
Show how you deduced the hypothesis, explain
how it was tested and indicate whether the
hypothesis is supported by the data.
Provide a brief error analysis.
See pages 1-231-24 for questions to guide your analysis
of the data.
Discussing Body Color
Inheritance
Build your discussion around the answers to the
following questions:
How did you determine whether the yellow body color
allele is dominant or recessive?
How did you determine whether the yellow body color
allele is autosomal or sex-linked?
Considering the chi-square analysis, how well does the
data fit your hypothesis?
Propose plausible sources of variation for any
discrepancies you observe.
Considering the entire set of data, has your hypothesis
been supported by this experiment?
Discussing Genetic Mapping
Build your discussion around the answers
to the following questions:
How did you determine the gene order?
How did you determine the gene distances?
How well does this data fit with expected values?
Propose plausible sources of variation for any
discrepancies you observe.
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Conclusion
This is a concise summary of all of the
results expressed in a 2-3 sentence
conclusion.
For example: “These data indicate that mutations in
genomic DNA increase with age and that the rate of
these mutations occurs faster in men than women.”
Length of each section
(written material)
Statement of Hypothesis: 1 paragraph
Results: 1-2 pages (longer if tables are included)
Discussion 2-3 pages
Summary: 2-3 sentences
TOTAL LENGTH: 4-6 pages of typed
material
Tables can be included on additional pages or
integrated into the text, as you prefer.