TEACHING ALL VOLUMES SUBMIT WORK SEARCH TIEE
VOLUME 2: Table of Contents TEACHING ISSUES AND EXPERIMENTS IN ECOLOGY
ISSUES: FIGURE SETS

Figure Set 3: How Engineered Genes Persist in Wild Populations

Purpose: To analyze the fitness of weed-crop hybrids. This will introduce some potential problems associated with crop biotechnology, including ‘superweeds.’
Teaching Approach: "citizen's argument"
Cognitive Skills: (see Bloom's Taxonomy) — knowledge, comprehension, application
Student Assessment: essay

FIGURE SET 3

Figure 3a

Figure 3a. Performance in wild (W x W) vs. hybrid (W x C) radish plants (from Klinger, T., and N. C. Ellstrand. 1994. Engineered genes in wild populations: fitness of weed-crop hybrids of Raphanus sativus. Ecological Applications 4: 117-120).

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Figure 3b

Figure 3b. Comparison of the hybrid and nonhybrid weed in terms of: (A) Mean number of tillers produced per plant; (B) Mean aboveground biomass per plant; (C) Belowground dry biomass (from Arriola, P. E., and N. C. Ellstrand. 1997. Fitness of interspecific hybrids in the genus sorghum: persistence of crop genes in wild populations. Ecological Applications 7: 512-518).

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