The graphs below show the frequency of the b+ allele over twenty generations in two populations of heterozygous

flour beetles (data for a population of ten individuals is shown in graph A; data for a population of one hundred
individuals is shown in graph B). Why does the frequency of the b+ allele increase in both populations?



a. b+ is a lethal allele
b. b+ is a balanced polymorphism
c. b+ is a fixed allele
d. the b+ allele is adaptive
e. b+ is a neutral mutation


ANSWER: d

Biology & Microbiology

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In Figure 17-1, the purpose of growing the donor cells in nutrient-limited media is:


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b. to replicate a normal environment.
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d. to induce favorable mutations.
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Biology & Microbiology