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Question 19N.3.HL.TZ0.c

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Date November 2019 Marks available [Maximum mark: 3] Reference code 19N.3.HL.TZ0.c
Level HL Paper 3 Time zone TZ0
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 3]
19N.3.HL.TZ0.c

Explain how marker genes are used in genetic modification.

[3]

Markscheme

a. «marker genes» are attached to target genes and inserted into bacteria/host cells ✔ OWTTE

b. «marker genes» confirm that the target gene has been successfully integrated into the genome/ plasmid ✔

c. «marker genes» for antibiotic resistance/fluorescence ✔

d. antibiotic is added to the media used to grow the bacteria
OR
UV light is used «to detect fluorescence» ✔

e. genetically modified bacteria will survive
OR
successful transgenic organisms will fluoresce
OR
allow researchers to identify the bacteria that have been modified ✔

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