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12/7/2016
Figure 21.13
Figure 21.13a
Field Study
Results
10
Number of individuals
Field Study
Soapberry bug with beak
inserted in balloon vine
fruit
8
6
4
On native species,
balloon vine
(southern Florida)
Beak
2
0
Average for museum specimens
10
On introduced
species,
goldenrain tree
(central Florida)
8
6
4
2
0
6
7
8
9
Beak length (mm)
10
Soapberry bug with beak
inserted in balloon vine
fruit
11
© 2014 Pearson Education, Inc.
© 2014 Pearson Education, Inc.
The Evolution of Drug-Resistant Bacteria
 The bacterium Staphylococcus aureus is
commonly found on people
 Methicillin works by inhibiting a protein used by
bacteria to produce cell walls
 One strain, methicillin-resistant S. aureus (MRSA)
is a dangerous pathogen
 MRSA bacteria use a different protein in cell wall
production
 Resistance to penicillin evolved in S. aureus by
1945, two years after it was first widely used
 When exposed to methicillin, MRSA strains are
more likely to survive and reproduce than
nonresistant S. aureus strains
 Resistance to methicillin evolved in S. aureus by
1961, two years after it was first widely used
© 2014 Pearson Education, Inc.
 MRSA strains are now resistant to many
antibiotics
© 2014 Pearson Education, Inc.