3.4.3 Genetic Diversity

Question 1

Antibiotic resistance in bacteria

Answer 1

Variation in bacteria due to mutation
Variation in bacteria due to the tranter of plasmids containing gene for an enzyme that hydrolyses antibiotic
Patient takes antibiotics – selection pressure.
Selection for antibiotic resistant allele
Bacteria with antibiotic resistant allele survive and increase in number by binary fission.
Bacteria without the antibiotic resistant allele die.
Number of antibiotic resistant bacteria increases.

Question 2

Use your knowledge of gene transmission to explain increase frequency of antibiotic resistant bacteria

Answer 2

Resistant gene
On plasmid
Spread by horizontal transmission
Conjugation