Download Darwin`s evidence for evolution PPT

Evolution: it’s all about
mutations that aid survival
and reproductive selection
Darwin and his evidences for
evolution
Darwin’s Evidences of evolution (15-3)
• First, review key ideas/terms:
– Struggle for existence
– Survival of the fittest
• Fitness
• Adaptation
• Natural selection
– Descent with modification
Evidence #1 (of 4)
The fossil record shows transitional forms of
organism
– Deeper you go down, older the organism is
– Ex.: ?
Evidence #2 (of 4)
The geographic distribution of living species
shows descent with modification of organisms
– Organisms with different ancestors look/behave
similarly if from similar environment
– Ex.: ?
Evidence #3 (of 4)
Homologous structures show similarities in body
parts with very different uses
– Ex.: ?
– Some structures may no longer have function,
called vestigial organs
– Ex.: ?
Evidence #4 (of 4)
Similarities in early development shows how we
all come from the same embryonic cells, in the
same pattern
– What does this imply?
– Ex.:
Which is the human embryo?
Which is the human embryo?