studies a primate that eats insects. The primate's favorite food is a type of ant. She asks if you are interested in helping her analyze the data. You, of course, say yes! Your professor tells you more about the ants, the primates, and the habitat. Ant color is determined by one gene. There are two alleles for this color gene: the brown allele and the green allele. The primates eat the ants year-round, but your professor knows that the way they eat the ants differs between the rainy season and the dry season. During the rainy season, when there are green leaves on the trees, the primates eat the ants off the green leaves. During the dry season, when the trees lose their leaves, the primates eat the ants off the brown tree branches. Your professor has collected data to investigate if the primate acts as a selective pressure on the ant population, possibly changing the allele frequencies over tim

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Imagine your anthropology professor studies a primate that eats insects. The primate's favorite food is a type of ant. She asks if you are interested in helping her analyze the data. You, of course, say yes! Your professor tells you more about the ants, the primates, and the habitat. Ant color is determined by one gene. There are two alleles for this color gene: the brown allele and the green allele. The primates eat the ants year-round, but your professor knows that the way they eat the ants differs between the rainy season and the dry season. During the rainy season, when there are green leaves on the trees, the primates eat the ants off the green leaves. During the dry season, when the trees lose their leaves, the primates eat the ants off the brown tree branches. Your professor has collected data to investigate if the primate acts as a selective pressure on the ant population, possibly changing the allele frequencies over time.
Step Two: The Rainy Season Data
Your professor is happy with the hypothesis that you have written. She gives you the data that
she collected on the ant population. Because of the fast rate of reproduction among ants, she
was able to collect a number of ants of each color over four generations. The data are in the
table below.
Table 1: Number of ants collected during the rainy season
Generation of ants
Generation 1
Generation 2
Generation 3
Generation 4
Brown ants
100
90
75
65
Green ants
100
120
Explorations Lab and Activities Manual
150
170
CC BY-NC
Total ants
200
210
225
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.
To calculate allele frequencies within each generation:
235
1. Calculate the number of brown alleles by multiplying the number of brown ants (from
Table 1) by 2. Calculate the number of green alleles by multiplying the number of green
ants (from Table 1) by 2. Write in Table 2.
2. Calculate the total number of alleles by adding the number of brown alleles and the
number of green alleles. Write in Table 2.
3. Calculate the brown allele frequency by dividing the number of brown alleles by the total
number of alleles. Round to the nearest thousandths. Write in Table 2.
4. Calculate the green allele frequency by dividing the number of green alleles by the total
number of alleles. Round to the nearest thousandths. Write in Table 2.
5. Check your math by calculating the total allele frequency. Write in Table 2.
http://explorations.americananthro.org/
Transcribed Image Text:Step Two: The Rainy Season Data Your professor is happy with the hypothesis that you have written. She gives you the data that she collected on the ant population. Because of the fast rate of reproduction among ants, she was able to collect a number of ants of each color over four generations. The data are in the table below. Table 1: Number of ants collected during the rainy season Generation of ants Generation 1 Generation 2 Generation 3 Generation 4 Brown ants 100 90 75 65 Green ants 100 120 Explorations Lab and Activities Manual 150 170 CC BY-NC Total ants 200 210 225 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. To calculate allele frequencies within each generation: 235 1. Calculate the number of brown alleles by multiplying the number of brown ants (from Table 1) by 2. Calculate the number of green alleles by multiplying the number of green ants (from Table 1) by 2. Write in Table 2. 2. Calculate the total number of alleles by adding the number of brown alleles and the number of green alleles. Write in Table 2. 3. Calculate the brown allele frequency by dividing the number of brown alleles by the total number of alleles. Round to the nearest thousandths. Write in Table 2. 4. Calculate the green allele frequency by dividing the number of green alleles by the total number of alleles. Round to the nearest thousandths. Write in Table 2. 5. Check your math by calculating the total allele frequency. Write in Table 2. http://explorations.americananthro.org/
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