Download Dot lab

Name __________________________________________
Date ________________
Natural Selection
DOTS Lab
CHOOSE YOUR PREDATOR!! ARGHH!!
How does natural selection really work?
Predation Round 1
Color
Total
Original
Population
Number
Consumed
Number of
Survivors
Survivors
X 3
(Reproduction)
New
Population
20
20
20
20
20
100
75
25
75
100
Predation Round 2
Color
Original
Population
Number
Consumed
Number of
Survivors
Survivors
X 3
(Reproduction)
New
Population
75
25
75
100
(New pop. 1)
Total
100
Predation Round 3
Color
Original
Population
Number
Consumed
Number of
Survivors
Survivors
X 3
(Reproduction)
New
Population
75
25
75
100
(New pop. 2)
Total
100
1
Predation Round 4
Color
Original
Population
Number
Consumed
Number of
Survivors
Survivors
X 3
(Reproduction)
New
Population
75
25
75
100
(New pop. 3)
Total
100
Predation Round 5
Color
Original
Population
Number
Consumed
Number of
Survivors
Survivors
X 3
(Reproduction)
New
Population
75
25
75
100
(New pop. 4)
Total
100
Predation Round 6
Color
Original
Population
Number
Consumed
Number of
Survivors
Survivors
X 3
(Reproduction)
New
Population
75
25
75
100
(New Pop. 5)
Total
100
2
Name:____________________________________________________ Date: _________
Natural Selection
Information- Dottus dottus is a species of awesome round insects. There are several
color varieties within this population, each determined by different alleles for the
color gene.
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Remember the 4 Tenants of Natural Selection!!
Genetic Variation – Population of Species have varieties of traits
Overproduction of Offspring – More offspring than can survive
Survival of the Fittest – the traits that are most suited for environment are
passed on
Over Time (Differential Survival and Reproduction) – variations make up most
of population & may be different from ancestors.
Data Analysis
The # Surviving Individuals
1. Graph your data for the number of survivors for each color and each generation.
Time in Generations
3
2. What colors (alleles) of prey were eaten in greatest numbers in your habitat?
3. How does their color compare to that of their habitat?
4. Why did the individuals that were picked up not reproduce?
5. In the habitat (cloth) you used, did any allele (color dots) increase in frequency
as generations went by?
6. Which tenant would explain which allele (color dots) survived in your habitat?
7. In your habitat was any allele (color dots) eliminated?
8. Which tenant would best explain the different alleles (colors dots)?
9. Can any correlation be made between the increase in any type of allele (color
dots) and the color of its habitat? What is the relationship?
10. What might happen if the dots were all the same color at the start of the
investigation?
11. In this experiment, what are the factors of the environment that are causing
natural selection?
12. Discuss this lab as a model of natural selection (4 tenants). How is it
unrealistic?
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