Flour beetles, Tribolium castaneum, are easy to keep and widely used as laboratory animals. They consume wheat and other grains while being adapted to survive in very dry environments. The flour beetles are major pests in the agricultural industry, in particular cereal silos, and are highly resistant to insecticides. An experiment was conducted over 20 generations using different populations of flour beetles over 20 generations. Using breakfast cereal as a food source, two different populations of 10 (figure 1) and 100 (figure 2) were studied with each beetle being heterozygous for alleles b+ and b alleles. The frequency of the b+ allele was measured in the population after every generation. 100% 100% Frequency of b+ allele Frequency of bt alele 50% 12 generations 16 20 generations Figure 1. Population of 10 flour beetles over 20 generations Figure 2. Population of 100 flour beetles over 20 generations *** Identify the dependent variable in the experiment whose data are shown in the figure above. Identify the negative control group in experiment. Justify the use of breakfast cereal for each population.
Flour beetles, Tribolium castaneum, are easy to keep and widely used as laboratory animals. They consume wheat and other grains while being adapted to survive in very dry environments. The flour beetles are major pests in the agricultural industry, in particular cereal silos, and are highly resistant to insecticides. An experiment was conducted over 20 generations using different populations of flour beetles over 20 generations. Using breakfast cereal as a food source, two different populations of 10 (figure 1) and 100 (figure 2) were studied with each beetle being heterozygous for alleles b+ and b alleles. The frequency of the b+ allele was measured in the population after every generation. 100% 100% Frequency of b+ allele Frequency of bt alele 50% 12 generations 16 20 generations Figure 1. Population of 10 flour beetles over 20 generations Figure 2. Population of 100 flour beetles over 20 generations
*** Identify the dependent variable in the experiment whose data are shown in the figure above. Identify the negative control group in experiment. Justify the use of breakfast cereal for each population.
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