Read the passage and solve number 1Number 1A) A fixed allele is an allele that is the only allele for a particular gene in a population. Identify how many populations of flour beetles that the b+ allele became fixed during the experimentB) After 20 generations, the scientist continued the experiment for another 20 generations. Predict what will happen to the frequency of the b+ and b alleles in the next 20 generations. Justify your prediction Flour beetles, Tribolium castaneum, are easy to keep and widely used as laboratory animals. Theyconsume wheat and other grains while being adapted to survive in very dry environments. The flourbeetles are major pests in the agricultural industry, in particular cereal silos, and are highly resistant toinsecticides.eAn experiment was conducted over 20 generations using different populations of flour beetles over 20generations. 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 ofthe b+ allele was measured in the population after every generation.100%100%50%50%12201620generationsgenerationsFigure 1. Population of 10 flour beetles over 20generationseFigure 2. Population of 100 flour beetles over 20generations-Frequency of b+ alleleFrequency of b+ allele

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Read the passage and solve number 1

Number 1

A) A fixed allele is an allele that is the only allele for a particular gene in a population. Identify how many populations of flour beetles that the b+ allele became fixed during the experiment

B) After 20 generations, the scientist continued the experiment for another 20 generations. Predict what will happen to the frequency of the b+ and b alleles in the next 20 generations. Justify your prediction

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.e
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%
50%
50%
12
20
16
20
generations
generations
Figure 1. Population of 10 flour beetles over 20
generationse
Figure 2. Population of 100 flour beetles over 20
generations-
Frequency of b+ allele
Frequency of b+ allele

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