The title of Darwin's evolutionary biology book in
On the Origin of Species by Means of Natural
Selection, or the Preservation of Favoured Races in
the Struggle for Life
Darwin suggested that Natural Selection is the
mechanism of evolution.
Think. Pair. Share.
What is happening in this picture?
Natural selection is the favouring of a trait that is
best suited for survival in its environment.
These traits arise from mutations.
(Is this real?)
Many different traits within a species is called
variation, and these variations are heritable.
Depending on the environment, different traits from
a variety of species are more viable.
•There is a population of mice living in a parking lot.
Some are white and some are grey.
•When a predator flies over the parking lot, it will eat
the first mouse it sees.
•Since the grey mice are more difficult to see on the
concrete, white mice will be eaten more often than
•Nature has selected the grey fur allele for survival in
•The white fur allele may eventually die out in the
parking lot population.