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palantriel palantriel
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6 years ago
The selective advantage linked to the high frequency of the cystic fibrosis allele in Caucasians is:
  a. an increased resistance to falciparum malaria.
  b. the prevention of excessive water loss associated with certain types of diarrhea.
  c. production of an enzyme to break down cholera toxin.
  d. increased mucous secretions for the removal of infectious cells.
  e. an increased probability of Salmonella infection.

Question 2

In individuals with cystic fibrosis:a.
   the mucus enhances the action of the cilia that line the bronchi.
  b. the mucus prevents the growth of dangerous bacteria in the respiratory system.
  c. the mucus in the respiratory system is thinner than in unaffected individuals.
  d. abnormal mucous secretions occur throughout the body systems.
  e. abnormal mucous secretions inhibit infections by bacteria.
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RANDAWOORANDAWOO
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