You observe dwarfed truffula trees (a different species from those discussed in
ID: 32902 • Letter: Y
Question
You observe dwarfed truffula trees (a different species from those discussed in the Dr. Seuss book, the Lorax) in two different areas. In area one, the average of the heights are larger than are two.
1) How would you test the differences in height were genetic constraints or just a phenotypic response to the environments where they were growing?
2) What would you measure
3) State an "if...then.." hypothesis?
4) Would you test this both in the lab and in the fleid?
5) What would be the advantage or disadvantage of each test
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Explanation / Answer
1)
To know the height is a genetic trait, the F1 individuals are crossed and height of F2 generation is observed (this may result in mendelian monohybrid ratio). To know the height variation among the plants is caused due to environmental factors various environmental factors like temeperature stress, water stress and salt stress must be given nd compared to a control group of plants and results must be carefully observed.
2)
In genetic analysis, the number of tall and dwarf plants are measured. In environmental stress experiments the tolerance of plants to stress and their effect on height is measured.
3)
if the height trait in platns is influenced by genetic factors and then this would result in Mendelian monohybrid ratio. If the environmental factors influence the height of plants then either one or more factors influencing the trait must be known.
4)
Yes. Both lab and field results are required to test the hypothesis. If lab results are encouragive, then they are used to confirm the factor influencing the trait (genetic or environment) in the field trials.
5)
The advantage is that the trait influence factor can be known by the experiment.
The disadvantage is the difficulty in recording the observations and results which may give false positive or negative results.
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