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AP Biology
AP Biology
Lab Review
AP Biology
BIG IDEA 1: EVOLUTION
AP Biology
Lab: Artificial Selection
Concepts:
Natural selection = differential reproduction
in a populationPopulations change over time evolution
Natural Selection vs. Artificial Selection
AP Biology
Lab: Artificial Selection
Description:
Use Wisconsin Fast Plants to perform
artificial selection
Identify traits and variations in traits
Cross-pollinate (top 10%) for selected trait
Collect data for 2 generations (P and F1)
AP Biology
Sample Histogram of a Population
AP Biology
Lab: Artificial Selection
Analysis & Results:
Calculate mean, median, standard deviation,
range
Are the 2 populations before and after selection
(P and F1) actually different?
Are the 2 sub-populations of F1 (hairy vs. non-
hairy) different?
Are the means statistically different?
A T-test could be used to determine if 2 sets of
data are statistically different from each other
AP Biology
Lab: Mathematical Modeling:
Hardy-Weinberg
Concepts:
Evolution = change in frequency of alleles
in a population from generation to
generation
Hardy-Weinberg EquilibriumAllele Frequencies (p + q = 1)
Genotypic Frequencies (p2+2pq+q2 = 1)
Conditions:1. large population
2. random mating
3. no mutations
4. no natural selection
5. no migration
AP Biology
Lab: Mathematical Modeling:
Hardy-Weinberg
Description:
Generate mathematical models and
computer simulations to see how a
hypothetical gene pool changes from one
generation to the next
Use Microsoft Excel spreadsheet
p = frequency of A allele
q = frequency of B allele
AP Biology
Lab: Mathematical Modeling:
Hardy-Weinberg
AP Biology
Lab: Mathematical Modeling:
Hardy-Weinberg
Setting up Excel spreadsheet
AP Biology
Lab: Mathematical Modeling:
Hardy-Weinberg
Sample Results
AP Biology
Lab: Mathematical Modeling:
Hardy-Weinberg
Analysis & Results:
Null model: in the absence of random events
that affect populations, allele frequencies
(p,q) should be the same from generation to
generation (H-W equilibrium)
Analyze genetic drift and the effect of
selection on a given population
Manipulate parameters in model:
Population size, selection (fitness),
mutation, migration, genetic drift
AP Biology
Lab: Mathematical Modeling:
Hardy-Weinberg
Real-life applications:
Cystic fibrosis, polydactyly
Heterozygote advantage (Sickle-Cell
Anemia)
AP Biology
Lab: Comparing DNA Sequences using BLAST Evolutionary Relationships
Concepts:
Bioinformatics: combines statistics, math
modeling, computer science to analyze
biological data
Genomes can be compared to detect genetic
similarities and differences
BLAST = Basic Local Alignment Search Tool
Input gene sequence of interest
Search genomic libraries for identical or
similar sequences
AP Biology
Lab: Comparing DNA Sequences using BLAST Evolutionary Relationships
Description:
Use BLAST to compare several genes
Use information to construct a cladogram
(phylogenetic tree)
Cladogram = visualization of evolutionary
relatedness of species
AP Biology
Lab: Comparing DNA Sequences using BLAST Evolutionary Relationships
AP Biology
Lab: Comparing DNA Sequences using BLAST Evolutionary Relationships
Use this data to construct a cladogram
of the major plant groups
AP Biology
Lab: Comparing DNA Sequences using BLAST Evolutionary Relationships
Fossil specimen in China
DNA was extracted from preserved tissue
Sequences from 4 genes were analyzed using BLAST
AP Biology
Lab: Comparing DNA Sequences using BLAST Evolutionary Relationships
AP Biology
Lab: Comparing DNA Sequences using BLAST Evolutionary Relationships
Analysis & Results:
BLAST results: the higher the score, the
closer the alignment
The more similar the genes, the more recent their common ancestor located
closer on the cladogram
AP Biology
Lab: Comparing DNA Sequences using BLAST Evolutionary Relationships
AP Biology
BIG IDEA 2: CELLULAR
PROCESSES: ENERGY AND
COMMUNICATION
AP Biology
Diffusion & Osmosis
Concepts:
Selectively permeable membraneDiffusion (high low concentration)
Osmosis (aquaporins)Water potential ( )
= pressure potential ( P) + solute potential ( S)
Solutions:
Hypertonic
hypotonic
isotonic
AP Biology
Diffusion & Osmosis
AP Biology
Diffusion & Osmosis
Description:
Surface area and cell size vs. rate of
diffusion
Cell modeling: dialysis tubing + various
solutions (distilled water, sucrose, salt,
glucose, protein)
Identify concentrations of sucrose solution
and solute concentration of potato cores
Observe osmosis in onion cells (effect of
salt water)
AP Biology
Diffusion & Osmosis
AP Biology
Potato Cores in Different Concentrations of
Sucrose
AP Biology
Diffusion & Osmosis
ConclusionsWater moves from high water potential ( )
(hypotonic=low solute) to low water potential ( ) (hypertonic=high solute)
Solute concentration & size of molecule
affect movement across selectively
permeable membrane
AP Biology
AP Biology
Photosynthesis
Concepts:
Photosynthesis6H2O + 6CO2 + Light C6H12O6 + 6O2
Ways to measure the rate of photosynthesis:
Production of oxygen (O2)
Consumption of carbon dioxide (CO2)
AP Biology
Photosynthesis
Description:
Paper chromatography to identify pigments
Floating disk technique
Leaf disks float in water
Gases can be drawn from out from leaf using syringe leaf sinks
Photosynthesis O2 produced bubbles form
on leaf leaf disk rises
Measure rate of photosynthesis by O2 production
Factors tested: types of plants, light intensity, colors
of leaves, pH of solutions
AP Biology
Plant Pigments & Chromatography
Floating Disk Technique
AP Biology
PhotosynthesisConcepts:
photosynthesis
Photosystems II, IH2O split, ATP, NADPH
chlorophylls & other plant pigments
chlorophyll a
chlorophyll b
xanthophylls
carotenoids
experimental designcontrol vs. experimental
AP Biology
AP Biology
Cellular Respiration
Concepts:
Respiration
Measure rate of respiration by:
O2 consumption
CO2 production
AP Biology
Cellular Respiration
Description:
Use respirometer
Measure rate of respiration (O2 consumption)
in various seeds
Factors tested:
Non-germinating seeds
Germinating seeds
Effect of temperature
Surface area of seeds
Types of seeds
Plants vs. animals
AP Biology
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Cellular Respiration
AP Biology
Cellular Respiration
AP Biology
Cellular Respiration
Conclusions:temp = respiration
germination = respiration
Animal respiration > plant respirationsurface area = respiration
Calculate Rate
AP Biology
Cellular Respiration
AP Biology
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BIG IDEA 3: GENETICS AND
INFORMATION TRANSFER
AP Biology
Mitosis & Meiosis
Concepts:Cell Cycle (G1 S G2 M)
Control of cell cycle (checkpoints)
Cyclins & cyclin-dependent kinases (CDKs)
Mitosis vs. MeiosisCrossing over genetic diversity
AP Biology
Mitosis & Meiosis
AP Biology
Mitosis & Meiosis
AP Biology
Mitosis & Meiosis
Description:
Model mitosis & meiosis (pipecleaners, beads)
How environment affects mitosis of plant roots
Lectin - proteins secreted by fungus
Root stimulating powder
Count # cells in interphase, mitosis
Observe karyotypes (cancer, mutations)
Meiosis & crossing over in Sordaria (fungus)
AP Biology
Mitosis & Meiosis
AP Biology
Mitosis & Meiosis
AP Biology
Abnormal karyotype = Cancer
AP Biology
Meiosis: Crossing over in Prophase I
AP Biology
Mitosis & Meiosis
Observed crossing over in fungus (Sordaria)
Arrangement of ascospores
AP Biology
Sordaria Analysis
% crossovertotal crossover
total offspring=
distance from
centromere
% crossover
2=
AP Biology
Bacterial Transformation
Concepts:
Transformation: uptake of foreign DNA from
surroundings
Plasmid = small ring of DNA with a few genes
Replicates separately from bacteria DNA
Can carry genes for antibiotic resistance
Genetic engineering: recombinant DNA = pGLO
plasmid
AP Biology
Bacterial Transformation
AP Biology
Bacterial Transformation
AP Biology
Bacterial Transformation
Conclusions:
Foreign DNA inserted using vector (plasmid)
Ampicillin = Selecting agent
No transformation = no growth on amp+ plate
Regulate genes by transcription factors (araC protein)
AP Biology
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Restriction Enzyme Analysis of DNA
Concepts:
Restriction Enzymes
Cut DNA at specific locations
Gel Electrophoresis
DNA is negatively charged
Smaller fragments travel faster
AP Biology
Restriction Enzyme Analysis of DNA
Description
AP Biology
Restriction Enzyme Analysis of DNA
Determine DNA fragment sizes
AP Biology
Restriction Enzyme Analysis of DNA
Conclusions:
Restriction enzymes cut at specific
locations (restriction sites)
DNA is negatively charged
Smaller DNA fragments travel faster than
larger fragments
Relative size of DNA fragments can be
determined by distance travelled
Use standard curve to calculate size
AP Biology
BIG IDEA 4: INTERACTIONS
AP Biology
Lab: Energy Dynamics
Concepts:Energy from sunlight drives photosynthesis
(store E in organic compounds)
Gross Productivity (GPP) = energy captured
But some energy is used for respiration (R)
Net primary productivity (NPP) = GPP – R
Energy flows! (but matter cycles)Producers consumers
Biomass = mass of dry weight
AP Biology
Lab: Energy Dynamics
Pyramid of Energy
Pyramid of Biomass
Pyramid of Numbers
AP Biology
Lab: Energy Dynamics
Description:Brassica (cabbage) cabbage white
butterfly larvae (caterpillars)
AP Biology
Lab: Energy Dynamics
Measuring Biomass:Cabbage mass lost
Caterpillar mass gained
Caterpillar frass (poop) dry mass
AP Biology
Lab: Energy Dynamics
Conclusions:
AP Biology
Lab: Energy Dynamics
Conclusions:
Energy is lost (respiration, waste)
Conservation of Mass
Input = Output
AP Biology
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AP Biology
Lab: Transpiration
Concepts:
Transpiration
Xylem
Water potential
Cohesion-tension hypothesis
Stomata & Guard cells
Leaf surface area & # stomata vs. rate of
transpiration
AP Biology
Lab: Transpiration
AP Biology
Lab: Transpiration
Description:
Determine relationship between leaf surface
area, # stomata, rate of transpirationNail polish stomatal peels
Effects of environmental factors on rate of
transpiration
Temperature, humidity, air flow (wind),
light intensity
AP Biology
Analysis of Stomata
AP Biology
Rates of Transpiration
AP Biology
Lab: Transpiration
Conclusions:transpiration: wind, light
transpiration: humidity
Density of stomata vs. transpiration
Leaf surface area vs. transpiration
AP Biology
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AP Biology
Lab: Animal Behavior
Concepts:
Experimental designIV, DV, control, constants
Control vs. Experimental
Hypothesis
innate vs. learned behavior
choice chamberstemperature
humidity
light intensity
salinity
other factors
AP Biology
Lab: Animal Behavior
Description:
Investigate relationship between
environmental factors vs. behavior
Betta fish agonistic behavior
Drosophila (fruit fly) behavior
Pillbug kinesis
AP Biology
Lab: Animal Behavior
AP Biology
Lab: Animal Behavior
Hypothesis Development
Poor:
I think pillbugs will move toward the wet
side of a choice chamber.
Better:
If pillbugs are randomly placed on two
sides of a wet/dry choice chamber and
allowed to move about freely for
10 minutes, then more pillbugs will be
found on the wet side because they
prefer moist environments.
AP Biology
Lab: Animal Behavior
Experimental Design sample size
AP Biology
Lab: Animal Behavior
Data Analysis:
Chi-Square Test
Null hypothesis: there is no difference
between the conditions
Degrees of Freedom = n-1At p=0.05, if X2 < critical value accept null
hypothesis (any differences between observed
and expected due to CHANCE)
AP Biology
Lab: Enzyme Activity
Concepts:
EnzymeStructure (active site, allosteric site)
Lower activation energySubstrate product
Proteins denature (structure/binding site changes)
AP Biology
Lab: Enzyme Activity
Description:
Determine which factors affecting rate of
enzyme reactionH2O2 H2O + O2
Measure rate of O2 production
catalase
AP Biology
Turnip peroxidase Color change (O2 produced)
AP Biology
Lab: Enzyme Activity
Conclusions:
Enzyme reaction rate affected by:
pH (acids, bases)
Temperature
Substrate concentration
Enzyme concentration
Calculate Rate of Reaction
AP Biology