Transcript Bean Bunny Evolution

Bean Bunny Evolution
CREST
MARCH 15, 2016
Which bunny will survive the cold
Indiana winters?
“Bean Bunny Evolution”
How does natural selection affect gene
frequency over several generations? What will
happen to the F and f alleles in rabbits over 5
generations?
Biology refresher before we begin…..
Natural Selection – process by which organisms best-suited to their
environmental conditions are most likely to survive and reproduce
Gene – section of a chromosome that contains information coding
for that trait
Allele – one of two or more alternating forms of a gene
Gene frequency – how often the different alleles of a gene occur
Evolution – on a genetic level is a change in frequency of alleles in a
population over a period of time
“Bean Bunny Evolution”
Allele Letter
Allele for
Allele type
F
Fur
Dominant
f
No fur
Recessive
“Bean Bunny Evolution”
Possible mating combinations
homozygous
FF
dominant
Fur
Ff
heterozygous
Fur
ff
homozygous
recessive
No Fur
“Bean Bunny Evolution”
How does natural selection affect gene
frequency over several generations? What will
happen to the F and f alleles in rabbits over 5
generations?
With a partner create a hypothesis from this
opening lab question
“Bean Bunny Evolution”
If rabbits with F (fur) and
f (no fur) alleles mate for 5 generations,
then the gene frequency of F alleles will
increase and the gene frequency of f
alleles will decrease.
“Bean Bunny Evolution”
Using simple materials, how could we
design an experiment to test our
hypothesis?
Today’s experiment
Red beans – F allele for fur
White beans – f allele for no for
Paper bag – Indiana fields, setting for
rabbits mating
Paper plates – mating results
Today’s procedure
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Place red and white beans in brown bag
Select 2 beans at a time
Place pair in appropriate plate (FF, Ff, ff)
Record number of pairs in data chart for
first three columns
 Safety – don’t eat/throw the beans!
Trial run from the chief engineer
11 pairs
28 pairs
SET ASIDE
Trial run from the chief engineer
Let’s get some materials and take data for 5 trials!
Graphing
 Graph, graph and graph!!
 Superb life skill – graphs are
everywhere!
 Graphing mechanics
 Scatter plots
 Best fit lines
 Analyzing trends
 Direct/indirect relationships
Scientific Argumentation
“CLEVER”
CLaim - make statement about experiment
EVidencE – use data, graphs to explain
Reasoning – explain how evidence supports
the claim
Analysis Questions and Assessment
Ramp up the rigor with a high level of questioning
Question students as they collect and graph data
◦Consider having check points in data collection
◦Does this data make sense?
◦Do you see any trends?
Lesson assessment is AP style questioning,
application of lab learnings
Successes and Challenges
Reflect for a few moments on the
successes and challenges of implementing
this lesson in a classroom…
You can use this reflection technique with
your students
“Bean Bunny Evolution”
Lesson Objective –
Model evolution by natural selection of the gene
frequency in two alleles in a population of organisms
Calculate and graph gene frequency
Connection to AP Biology – genetics, process of
evolution
Great math applications!
THANK YOU!
You do make a difference!!!