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Artificial Selection
Also called selective breeding
What is artificial selection?
• Humans choosing traits desirable to them
rather than nature choosing traits that are
passed on
• Humans have an effect on the evolution of a
species rather than letting nature choose the
path of evolution
When is artificial selection used?
Domesticated animals such as dogs
Farming crops and animals
Pharmaceuticals (new drugs)
Genetic engineering
Pros and Cons
• Pros:
– Humans can manipulate
organisms to benefit
– New variations of
organisms can be
produced (example:
cabbage, broccoli,
cauliflower are all
variations of the same
• Cons:
– Selectively bred
organisms are more
susceptible to
environmental changes
and diseases
– Inbreeding can become
a problem
– In animals artificial
selection can cause
health problems