19. (03.06 hc)
some individuals have a mutated recessive allele and a homozygous individual is resistant to hiv infection and aids. some populations have a high frequency of the mutant allele. what inference can be made about the mutant allele? (1 point)

heterozygous individuals must be genetically advantaged even if they are not resistant to hiv.
the mutated allele must have developed and been acquired by many people before exposure to the virus.
the mutated allele must not be inherited by offspring or the disease would be close to eradication.
being homozygous is an advantage for the mutated allele, while being heterozygous is a genetic disadvantage.
20. (03.07 mc)

some portion of the milk produced in the united states comes from cows treated with genetically manipulated hormones that increase a cow's milk production. this increased production farmers make a better return on their investment in each cow. what aspect of this biotechnology must be fully understood before the benefits can be justified? (1 point)

its effect on the cost of production
its effect on other animals in the dairy
its effect on the offspring of the cow
its effect on consumers of the milk
21. (03.07 hc)
what issues will society need to resolve regarding this developing biotechnology, such as recombinant dna technology? (1 point)

the issues regarding the cost of these procedures for patients
the question of who gets to benefit from these technologies
the issues surrounding its lack of medical benefits
the question of the long-term effects on consumers and the targeted species
22. (03.08 mc)
marissa and sean are in the process of adopting a baby. one of the documents the adoption agency provides is a full medical history of the birth mother. why would the birth father's medical history also be important? (1 point)

the father has greater impact on the health of the baby than the mother.
the father's history will be important only when the child also becomes a parent.
the father's medical problems will always be expressed in the child.
the father's history will suggest potential medical problems in the baby.
23. (03.08 mc)
paul's father and paternal grandfather both contracted but survived prostate cancer with treatment. which answer best explains what this means for paul? (1 point)

paul should know he has a higher risk of prostate cancer and take preventative steps.
paul should not worry about this history as both survived the cancer.
paul should have his prostate removed as soon as possible.
paul should live a healthy lifestyle and not worry about cancer at all.
24. (03.08 mc)
which of the following would most severely affect a human population? (1 point)

a high degree of genetic similarity among people
a high degree of illegal drug use among young adults
a high number of smokers in a community
a high rate of mental disorders
25. (03.08 hc)
meredith's office had a large group of people out sick at the same time with the flu. which of the following is the most likely cause of the mass illness? (1 point)

lack of cleanliness in the office kitchen
mutation in the type of flu virus, making it resistant
germs being spread by person-to-person contact
inadequate ventilation system in the office