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# Natural selection lab

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Natural selection lab
Questions:
Step One: Hypothesis
1. How do the ants vary? The ants vary depending on their color. During the rainy season,
the brown ants reduce while in dry season, the green ants reduce in population.
2. What is the selective pressure? Ants color
3. What is the dependent variable? Ants population
4. What is the independent variable? Seasons; rainy or dry.
5. Now, write a hypothesis for the following question: During the rainy season, the green
ants will increase over time while during the dry season, they will reduce overtime.
Step Two: The Rainy Season Data
Table 1: Number of ants collected during the rainy season
Generation of ants
Brown ants
Green ants
Total ants
Generation 1
100
100
Generation 2
90
120
Generation 3
75
150
Generation 4
65
170
Calculate the frequency of the brown allele and of the green allele in each of the generations. We
assume that each ant is a homozygote. Round to the nearest thousandths.
Table 2: Allele frequencies in the rainy season
Generation
1
Generation
2
Generation
3
Generation 4
brown
Green
brown
green
brown
green
brown
green
Number of
alleles
200
200
180
240
150
300
130
340

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Total #
alleles in
generation
(brown +
green)
400
420
450
470
Allele
frequency
0.5
0.5
0.4286
0.5714
0.3333
0.6667
0.2766
0.7234
Total
allele
frequency
in
generation
(brown +
green)
1
1
1
1
Answer the following questions based on the above (rainy season) data.
1. What was the general trend (comparing Generation 1 to Generation 4) of the brown allele
frequency over the four generations? Did the brown allele frequency increase or decrease?
Write the actual numbers for each generation here in support of your answer.
The brown allele frequency decreased. The frequency of both ant colors was equal at the
beginning with each having an allele frequency of 0.5. However, the allele frequency of
the green color increased in the second generation at 0.5714 and the brown one reduced
to 0.4286. In the third generation, the allele frequency of the brown ant reduced further
to 0.3333 while that of the green allele increased to 0.6667. In the fourth generation, the
brown allele decreased to 0.2766 while that of the green color increased to 0.7234.
2. What was the general trend (comparing Generation 1 to Generation 4) in the green allele
frequency over the four generations? Did the green allele frequency increase or decrease?
Write the actual numbers for each generation here in support of your answer
The frequency of the green frequency increased from 0.5 to 0.5714 to 0.6667 to 0.7234
from the first to the fourth generation.
3. Was your hypothesis in Question 1 supported? Explain why or why not.
The hypothesis was supported. This is because, the population of brown ants reduced
gradually during the rainy season while that of green ants increased.

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Natural selection lab Questions: Step One: Hypothesis 1. How do the ants vary? The ants vary depending on their color. During the rainy season, the brown ants reduce while in dry season, the green ants reduce in population. 2. What is the selective pressure? Ants color 3. What is the dependent variable? Ants population 4. What is the independent variable? Seasons; rainy or dry. 5. Now, write a hypothesis for the following question: During the rainy season, the green ants will increase over time while during the dry season, they will reduce overtime. Step Two: The Rainy Season Data Table 1: Number of ants collected during the rainy season Generation of ants Brown ants Green ants Total ants Generation 1 100 100 200 Generation 2 90 120 210 Generation 3 75 150 225 Generation 4 65 170 235 Calculate the frequency of the brown allele and of the green allele in each of the generations. We assume that each ant is a homozygote. Round to the nearest thousandths. Table 2: Allele frequencies in the rainy season Generation Generation Generation Generation 4 1 2 3 brown Number of 200 alleles Green brown green brown green brown green 200 180 240 150 300 130 340 Total # alleles in generation 400 (brown + green) Allele 0.5 frequency Total allele frequency 1 in generation (brown + green) 420 0.5 0.4286 1 450 0.5714 470 0.3333 0.6667 0.2766 0.7234 1 1 Answer the following questions based on the above (rainy season) data. 1. What was the general trend (com ...
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