| Date | May 2018 | Marks available | 4 | Reference code | 18M.3.SL.TZ2.10 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 2 |
| Command term | Explain | Question number | 10 | Adapted from | N/A |
Question
Explain how plants can be genetically modified using the Ti plasmid so that they contain the gene for glyphosate resistance.
Markscheme
a. Ti plasmid is found in A tumefaciens / Agrobacterium
b. add transgene along with antibiotic resistance gene into Ti plasmid
c. Ti plasmid injected into host cell/plant «by A tumefaciens»
d. Ti plasmid induces tumors
e. Ti DNA becomes incorporated in host DNA
f. apply antibiotic to select for cells that have been transformed
Examiners report
