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- 70. Which of the following is most likely to be the direct result of lack of genetic diversity in a food crop such as corn? (A) Decreased kernel size (B) Decreased potential yield (C) Decreased dependence on chemical fertilizers (D) Increased susceptibility to plant disease (E) Increased resistance to pestsA) Using the information/image provided, why could the researchers rule out pollinator selection as a reason for flower color variation? B) What must be true about the flowers in Boechera stricta? A) Plants have both male and female flowers that are reproductively mature at the same time. B) Plants have both male and female flowers that are reproductively mature at different times. C) Plants produce either male or female flowers C) If the scientists' hypothesis is true, what type of herbivore defense is flower pigmentation in this mustard? either constitutive or inducible1. a. State IUCN (1980) definition of conservation of genetic resources.b. List and explain five (5) reasons why man should conserve plant species.
- 16. Would it be wrong to call plants obtained through micro-propagation as 'clones'? Comment. 17. How is a somatic hybrid different from a hybrid? 18. What is emasculation? Why and when is it done? 19. Discuss the two main limitations of plant hybridization programme. 20. Interspecific crosses are rare in nature and intergeneric crosses almost unknown. Why? 21. Differentiate between pisciculture and aquaculture.Clausen and colleagues proposed two hypotheses to explainthis variation within a species: (1) There are genetic differencesbetween populations of plants found at different elevations.(2) The species has developmental flexibility and can assumetall or short growth forms, depending on local abiotic factors.If you had seeds from yarrow plants found at low and highelevations, how would you test these hypotheses?3. Two lab groups combine their data from the cellular respiration lab. The results are shown here. Lines A & C are from Group 1. 0,7 0.6 Lines B & D are from Group 2. S os 0.4 B a. Which line(s) most likely represent non-germinated 0.3 seeds? 성 02 b. Give an interpretation of the results. Include 2 factors that might explain the difference between line A and B. 0.1 10 15 20 25 30 Time (min) hw) uondunsuo)
- 3. A farmer received a purchase order to supply hundreds of carnations for an event that will be held in two months'. As a horticulturist, you suggested the farmer to control the photoperiod to make sure that he could produce the number of carnations needed in time. By using your own words, explain the concept of photoperiodism and its types. Include examples of plants for each type. In your opinion, are plants in the tropical rainforests of Malaysia photoperiodic? State your justifications. [10 marks]corn id purple smooth Purple wrinkled yellow smooth yellow wrinkled W20-AB1-D-13 486 152 162 54 W21-BB1-A-19 445 152 154 94 W20-BB1-D-19 501 153 167 88 W20-AB1-C-16 489 153 94 56 W20-BB1-H-11 480 153 94 56 DIHYBRID CROSS1. ) Consider the possibility that your observational data are of plantsresulting from a dihybrid cross, where the previous generation were heterozygousfor both traits (RrSs x RrSs). Create a Punnett square for this cross and presentthe expected phenotypic ratio.2.) Present your results in a table as dihybrids and determine the observedphenotypic ratio of purple/smooth to purple/shrunken to yellow/smooth toyellow/shrunken. Consider the plant as a whole rather than the individual cobs.Clausen and colleagues proposed two hypotheses to explain this variation within a species: (1) There are genetic differences between populations of plants found at different elevations. (2) The species has developmental flexibility and can assume tall or short growth forms, depending on local abiotic factors. If you had seeds from yarrow plants found at low and high elevations, what experiments would you perform to test these hypotheses? Select the three experiments.
- 6. Compose an argument to defend whether offspring of strawberry plants or spinach plants would be more genetically diverse. For your argument, assume that strawberry plants use a form of reproduction called runners (see Figure 1) and that spinach plants reproduce through sexual reproduction. Figure 1. A drawing and picture of strawberry plant runners In your response, Font FIG. 56.-RUNNER OF THE STRAWBERRY. runner • Describe the cause-and-effect relationships between the type of reproduction and the resulting genetic variation of the offspring as compared to each other and the parent(s). • Use evidence and scientific reasoning to support your argument. • You may support your argument with one or more models (for example: labeled diagrams and/or one or more Punnett squares) Size Ω A A ▼ BIUS X₂ runner 99 ==Please answer the following questions for me: 1 Why is it important to determine whether or not genes that provides insecticide and fungi resistance may be transferred to wild sunflowers? 2. What factors would you measure (response, or dependent varibles)? 3. Fitness can be measured as a seed set (seed production) Why is it important to measure as seed production? 4. Cultivated sunflowers have one stem that produces one single large flower head, while wild flowers have many branches that produce many flowers. Why is it important to measure branching pattern (number of branches produced by F1 plants, backcrosses and wild type sunflowers? 5. Why is it important to include blackcrosses in the exeriment?Why is it important to preserve the genetic diversity of crops and their landraces and wild relatives? How can we preserve populations of honeybees and of native pollinators?