DP Biology (last assessment 2024)
Question 18M.3.HL.TZ1.10b
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.HL.TZ1.10b |
| Level | HL | Paper | 3 | Time zone | TZ1 |
| Command term | Explain | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
18M.3.HL.TZ1.10b
The graph shows the trends of the use of genetically modified corn in the United States (USA) from 2000 to 2015, including herbicide tolerant varieties (HT), insect resistant varieties (Bt) and varieties with both traits combined.
(b)
Explain how the Bt and HT combined crop was produced.
[2]
Markscheme
a. insect-resistant crops contain genes from the soil bacterium (Bacillus thuringiensis) Bt
b. herbicide (glyphosate) resistance gene has been introduced in plants
c. (resistance genes introduced) by vectors / physical methods / chemical methods
d. successfully modified plants are selected for further propagation
