Lab 1: Dependent and Independent Variables
Table 1: Average Yield for each seed variety at no, low, and high infestation levels (8 points) Seed Variety
Level of ECB Infestation
Table 2: % Reduction in yield for each seed variety at high levels of infestation (4 points) (transfer data on average yield with no infestation and high infestation from Table 1 to Table 2) Seed Variety
Avg. Yield with
Avg. Yield with High Infestation
Laboratory Analysis Questions
ECB refers to: (1 pt)
A genetically engineered plant that is resistant to insect pests b.
Edible corn byproducts
An insect pest that reduces corn yield
European corn borer
c and d
How many days are required for a corn seed to become a mature plant with maximum weight kernels ready to be harvested? (1 pt) a.
“BT Corn” refers to corn that: (1 pt)
Has been infested with insect pests
Has been infected with bacteria
Is resistant to ECB
Is not affected by pesticides
BT is: (1 pt)
A stomach poison produced by bacteria
A genetically engineered corn product
A bacterium carried by the European corn borer
A bacterium that has a gene for producing Cry proteins
Creation of BT corn requires genetic material from all of the following except: (1 pt) a.
European corn borer
a corn plant
all of the above contribute genetic material to the production of BT corn
For each seed variety, why did you need to collect data from 3 pots for each infestation level to obtain reliable data? (2 pts)
To get accurate results we need to test the experiment more than once.
What is an independent variable? Which variable in this experiment was the independent variable? What is a dependent variable? Which variable in this experiment was the dependent variable? (2 pts)
The independent variable is the variable representing the value being manipulated
or changed and the dependent variable is the observed result of the independent
variable being manipulated. In the experiment the level of ECB infestation is the
independent variable and the dependant variable is the yield of the corn plants in
term of kernel weight per ear of corn.
Which seed variety has the highest yield under conditions of no infestation? (1 pt)
Which transgenic seed variety was most resistant to the ECB at high infestation levels? (1 pt) BT 123
Which non-transgenic seed variety was most resistant to the ECB at high infestation levels? (1 pt) Golden Crop
Compare the yield of Super Harvest seeds and BT 123 seeds under conditions of no infestation. Is there any difference in the avg. yield? (2 pts)
Yes, a very miniscule difference is there. 0.4
11. A farmer decides to plant 90% of one field with BT 123 seeds and the remaining 10% of the field with a different seed variety. He hopes this will slow the evolutionary development of BT resistant insects. Which seed variety should he use the 10% of his field that is not planted with BT 123 seeds? Explain your answer. (2 pts) He should plant the golden crop for the remaining 10%. They have a larger yield than the...
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