Explain how herbicide-tolerant weeds (“superweeds”) could appear in areas nearby transgenic herbicide-tolerant
crops. What issues arise with this scenario? What will be an ideal response?
Transgenic herbicide-tolerant crops may cross with weeds, resulting in the transfer of the
herbicide-tolerant trait to the wild weed (gene flow). Weeds that can tolerate herbicide will
not be affected by herbicide spraying; therefore, the herbicide will no longer be effective
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What key words does the question contain and what do they mean?
What will be an ideal response?
Graduate students studying population genetics are assigned the task of determining the allele frequencies of gene Z in a population. After their study is completed, the graduate students report that the frequency of allele ZA is 67%, and the frequency of allele ZB is 23%. What conclusion can you draw from these results?
a. The studied population is in Hardy-Weinberg equilibrium. b. The sample size in this study was too small to produce accurate results. c. At least one more allele of gene Z exists in the studied population. d. The studied population is evolving toward a fully homozygous genotype.
Which of the following supports a detrital food web?
a. dead or decaying organisms b. photosynthetic organisms c. living autotrophs d. phytoplankton
An australopith is a(n) _____
a. craniate d. amniote b. vertebrate e. placental mammal c. hominoid f. all of these