Discuss factors that must be taken into account when setting standards for safe levels of exposure to potentially
harmful chemicals in the environment. Explain why setting these standards is such a complex task. What will be an ideal response?
ANSWER: Setting standards for safe levels of exposure to potentially harmful chemicals must take into
account population differences in allele frequencies, genotype frequencies, and differences in
the amount of a particular detoxifying enzyme present in cells to ensure that the most
sensitive members of the population, especially newborns and infants, are sufficiently
protected. The many alleles for all the genes carried by each individual is the result of the
random combination of parental genes and the sum of changes brought about by
recombination and mutation. This genetic combination confers a distinctive phenotype upon each person. Understanding the molecular basis for this individuality remains one of the great
challenges of human biochemical genetics.
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One of the most common types of mold spores are from
a. Aspergillus. b. Candida. c. Penicillium. d. Pilobolus
Regarding Investigating Life 22.5, how do the young leaves produce the sugary nectar that the ants eat?
A. from the ants B. by photosynthesis C. through their roots D. from their fruits E. by respiration
If your UV detector showed higher levels of UV radiation than normal, you might suspect changes in what layer of the atmosphere?
A. benthic zone B. ozone layer C. cumulus clouds D. particulate layer E. profundal zone
The accompanying figure shows what happens in insect populations when crops are sprayed with insecticides. This is an example of ___
A. founder effect B. genetic drift C. gene flow D. natural selection