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Beadle Plasticus
Evolution
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Beadle Plasticus Evolution
Student Handouts
Quick Guide
Safety
Student
Instructions
Turn to this page
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In this lab you will investigate the changes in a
population of Beadle plasticus, represented by the
beads in the bag. A population is a group of organisms
(living in the same area at the same time) that belong
to the same species. Members of the same species
can interbreed (mate) and produce fertile offspring.
The Beadle population you will study originally lived in
a forest environment.
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Part 1: Model Population Changes in a Desert Environment
A natural disaster has destroyed the original forest environment.
Some Beadles from the original forest population move into a desert
environment. You will model what happens to the different varieties
of Beadle plasticus in the desert environment.
1. Place the brown material in the bottom of
the plastic container labeled “Environment.”
This material represents the sand in the desert
environment.
2. There are four different varieties (types) of
Beadles. Count out five of each of the four
varieties of Beadles (beads) and spread these
on the material in the desert environment. Use
your hand to gently rub the beads around on
the material.
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3. There should be 20 Beadles in the desert population (five of each of
the four varieties). Use the equation in the box below to calculate the
frequency of each of the four different varieties of Beadles in the
population. Express your answer as a decimal number. Round to the
nearest hundredth.
Frequency of Beadle variety = Number of individuals of this Beadle variety
Total number of Beadles in the population
4. Record the frequency of
each Beadle variety in Column
1 of the Data Table. The Data
Table is on the last page of
this lab. You may tear this last
page off to make it easier to
record your data.
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Part 2: Model Population Changes in a Grassland Environment
A natural disaster has destroyed the original forest environment.
Some of the Beadles from the original forest population move into a
grassland environment. You will model what happens to the
different varieties of Beadle plasticus in grassland environment.
1. Place the piece of green material in the bottom of the plastic
container labeled “Environment”. This material represents the
grassland environment.
2. There are four different varieties of Beadles. Count out five of each
of the four varieties of Beadles and spread these on the material in
the grassland environment. Use your hand to gently rub the Beadles
around on the material. There should be 20 Beadles in the grassland
population (five of each variety).
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Part 3: Evolution and Natural Selection
1. Compare the desert environment and the grassland environment by
completing the following chart. Hint: Look back at the instructions in
Parts 1 and 2.
Desert
Grassland
Color of environment
Predators
Temperature
Disease
Food supply
2. According to Darwin’s Theory of Natural Selection, some
characteristics have adaptive value, giving individuals an advantage.
Individuals with adaptive variations are more likely than others to survive
and reproduce. The proportion (frequency) of individuals that have
adaptive variations will increase.
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Teacher
Information
Quick Guide
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Key
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