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12/7/2016
Figure 21.11
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© 2014 Pearson Education, Inc.
 Inference #2: This unequal ability of individuals to
survive and reproduce will lead to the
accumulation of favorable traits in the population
over generations
 Inference #1: Individuals whose inherited traits
give them a higher probability of surviving and
reproducing in a given environment tend to leave
more offspring than other individuals
© 2014 Pearson Education, Inc.
 Darwin was influenced by Thomas Malthus, who
noted the potential for human population to
increase faster than food supplies and other
resources
 If some heritable traits are advantageous, these
will accumulate in a population over time, and this
will increase the frequency of individuals with
these traits
 This process explains the match between
organisms and their environment
© 2014 Pearson Education, Inc.
© 2014 Pearson Education, Inc.