Download Lab Sporks and Beans Natural Selection AP Bio 2010

1
NAME: ______________________________________________ DATE: ______________ BLOCK: ___________
responsible for the spoon-like appearance of both the spoon and fork while the UF (caused by a
genetic mutation) is responsible for the fork-like appearance of the spork. These two alleles
show incomplete dominance. The genotype US US yields the phenotype of a spoon and the US UF
has a phenotype of a spork.
PART I: Spoon v. Spork
Predict:
1. Which phenotype (spoon or spork) will be the better predator and why do you think this?
Data:
Person
# of prey for spoon
# of prey for spork
1
2
Average
Conclusion:
2. Which phenotype (spoon or spork) was the better predator?
3. Think of a dolphin, tuna, and shark. What traits do they have in common that are useful in
an aquatic environment?
PART II: Population Competition
Predict:
4. In a population that contains 75% spoons and 25% sporks, which phenotype will eat more
prey and why do you think this?
2
Data:
Record the top six predators and the number of prey eaten.
Predator # or prey eaten
phenotype
1
2
3
4
5
6
Conclusion:
5. Which phenotype was more successful in the population and why?
PART THREE: Natural Selection
Predict:
6. If survivors are allowed to reproduce, what do you think will happen to spoons and sporks
over several generations?
Data:
#
Generation
spoons
1
2
3
4
5
6
#
sporks
# US
alleles
# UF
alleles
Freq. of
# US
allele
Freq. of
# UF
allele
3
Conclusion:
7. Explain what happened to the allele frequencies and why.
PART FOUR: Natural Selection Again
Predict:
8. What if the food source goes extinct and the only prey left changes to a harder, drier
food? What do you think will happen to the allele frequencies and why?
Data:
#
Generation
spoons
#
sporks
# US
alleles
# UF
alleles
Freq. of
# US
allele
Freq. of
# UF
allele
1
2
3
4
5
6
Conclusion:
9. What actually happened to the allele frequencies when the food source changed?
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DO YOU REALLY GET IT?
For each pair of statements, circle the letter of the statement that is true.
a. Mutations are detrimental to fitness.
b. A mutation may result in a more adaptive trait under certain environmental conditions.
c. New traits can appear in a population that are unnecessary and when there is already an
existing trait that is successful.
d. New traits appear as a result of need/use/disuse.
e. Acquired characteristics are heritable.
f. Acquired characteristics are not heritable.
g. Genetic variation is very important and relevant to evolution and natural selection.
h. Genetic variation is not important and irrelevant to evolution and natural selection.
i. Environmental conditions are not considered important in causing selective pressures.
j. Environmental conditions are considered important in causing selective pressures.
k. Survival is all that is needed to affect natural selection.
l. Survival is important, but reproductive success is also needed for natural selection.
m. Evolutionary change is based on the changing proportion of individuals with particular
alleles.
n. Evolutionary change is based on gradual modifications in traits, not the changing proportion
of individuals with particular alleles.
o. Evolution is deterministic and works toward a future goal.
p. Evolution is the result of organisms interacting with current environmental conditions, and
is not goal oriented.