HWrkSht 1_17
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1. Boll weevil insects, shown in the picture below, feed on cotton plants. There are two varieties of cotton plant, original variety (V) and a genetically engineered boll weevil resistant variety (R).
Three farms were used to compare the yield of the two varieties. Each farmer planted two fields, one of each variety. All fields were treated identically. The yield of cotton from each field was weighed. The results are shown in the bar graph below.
a) Calculate the average yield of V cotton
b) Calculate the percentage difference in yield between the two varieties of cotton grown at Farm X.
c) i) Name the variable altered in this investigation.
ii) The fields planted with V cotton were used as a control. Give a reason for using this control.
iii) Explain why using ten farms instead of three would have improved this investigation.
d) What conclusion can be drawn from these results?
e) i) In the production of the R variety of cotton, a molecule was transferred into the cotton cells.What type of molecule was this?
ii) The farmers use pesticides to kill insects which damage their crops.Explain why less pesticide is needed when growing R cotton.
iii) What environmental benefit might the use of the genetically engineered variety of cotton bring?
2. In the boxes below, describe each of the steps carried out to transfer successfully a human gene into a bacterial cell
3. A manufacturer uses genetic engineering techniques to make a variety of products. The table below shows each product as a percentage of their total production in 2010.
Use the information in the table to make a pie chart. The guide below may help you to plan it.
4. The diagram below shows stages in the process of genetic engineering.
a) Name parts X and Y
