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Use the following passage to answer the next three questions It has been hypothesized that people who are heterozygous for the allele that causes the deadly genetic condition cystic fibrosis which among other symptoms reduces fertility are more resistant to the deadly disease tuberculosis If the cystic fibrosis allele protects against tuberculosis the same way the sickle cell allele protects against malaria then which of the following should be true of a comparison between regions with and without tuberculosis O A Cystic fibrosis deaths should be more common in regions with tuberculosis OB Cystic fibrosis deaths should be less common in regions with tuberculosis OC Cystic fibrosis deaths should be equally common in both types of regions D Regional differences in the cystic fibrosis death rate should be purely random and unpredictable Reset Selection Question 5 of 8 1 Points A person who is heterozygous for the cystic fibrosis allele moves to a small isolated community where no one previously carried the allele If the cystic fibrosis allele protects against tuberculosis the same way the sickl allele protects against malaria what should happen to the frequency of the cystic fibrosis allele in the community over time and why A The cystic fibrosis allele should disappear from the population because a single individual with the allele is not enough for it to proliferate B The cystic fibrosis allele should increase to a relatively high frequency because heterozygotes with the allele will be more likely to survive than others C The cystic fibrosis allele should become fixed in the population due to genetic drift OD The cystic fibrosis allele should either disappear or increase in frequency depending on chance as well as on tuberculosis prevalence and death rate

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