evolution: natural selection ala mr. sapora
TRANSCRIPT
Darwin had discovered and described for the first time:!
A process in nature - a scientific mechanism - that could operate like artificial selection.!
Western Toad!Bufo boreas!
Individuals have natural variation among their heritable traits. Some of those variants are better suited
to their environment than others.!
Individuals with adaptations that are well suited to their environment can survive and reproduce and are
said to have high fitness.!
❖ The Mechanism for Biological Evolution!
the process by which organisms with variations most suited to their local environment survive
and leave more offspring.!
If local environmental conditions change, some traits that were once adaptive may no longer be useful, and different
traits may become adaptive.!