Natural Selection in Action - Resistance in Bacteria
Gap-fill exercise
Natural selection results in
to the environment being
and passed on. So, with time, the
will become better adapted.
If a person has a
infection, some of the bacteria will have more
to antibiotics.
When the person starts their course of
, many bacteria will die quickly. However a few with more
will still be alive, even though the person feels quite well. If the person then stops taking the antibiotics, then the more resistant bacteria will
. Over time this can lead to strains of bacteria that are very resistant to many antibiotics -
.
If the person had continued to take their antibiotic course, even the
resistant ones would eventually have been
.
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