Should we buy and eat food that comes from genetically modified plants and animals? Defend your answer based on
previous knowledge and on what you learned from this chapter. What will be an ideal response?
ANSWER: Answers will vary. Students should address one or more controversial uses of biotechnology.
Here are two examples:Critics
have raised concerns that the use of herbicide-resistant corn and soybeans will speed
the development of herbicide-resistant weeds and increase our use of and dependence on
chemical herbicides. Others point to the possibility that genetically engineered traits may be
transferred to other organisms, leading to irreversible and deleterious changes in ecosystems.
Genetically modified sheep, rabbits, and cows are being used to produce medically important
human proteins in their milk. These proteins are, or soon will be, used in clinical trials to treat
human diseases such as emphysema and Pompe disease.
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Two species of tree frogs that live sympatrically in the northeastern United States differ in ploidy: Hyla chrysoscelis is diploid, and Hyla versicolor is tetraploid. The frogs are identical in appearance, but their mating calls, which females use to find
mates, differ. Which difference most likely evolved first? A) polyploidy B) difference in mating calls C) Polyploidy and different mating calls must have evolved at the same time.
Lymphocytes are involved in the immune response. Indicate whether the statement is true or false
If a mammal is born without the ability to produce EGF (epidermal growth factor), then its
A) ability to increase cell division when needed would diminish. B) Cdks will not function properly. C) cell cycles will not contain the proper checkpoints. D) licked wounds will heal faster than usual.
The (peroxide/superoxide/hydroxyl) radical is formed during the incomplete reduction of O2 during electron transport in aerobes
What will be an ideal response?