Download Evidence for Evolu[[[irtion

Mechanism of Evolution
Biogeographythe study of
where organisms
live now and
where they and
their ancestors
lived in the past.
Many recently discovered
fossils form series that trace
the evolution of modern
species from extinct ancestors.
The greatest shark to have ever lived! An apex predator, the
Carcharodon megalodon comes from the Greek word for “big tooth”.
This shark was as big as a bus at a length of 60 feet and estimated to
weigh between 30-60 tons. Their skeletons were made of cartilage,
like those of modern sharks. This resulted in poor to no fossilization
of their skeletons and therefore is rarely found in the fossil record.
2. Comparative Anatomy
A. Homologous Structures-
similar structures that are
different in function
b. Vestigial Structures
•Structures that serve
no apparent purpose in
the organism that has it
c. Analogous Structures
•Similar structures in
unrelated organisms
3. Embryological
Development
• The comparative
study of embryos
during
development at
various stages
4. Homologous Molecules
• Comparisons of DNA sequences
and amino acid sequences in
proteins
* Amino acid sequence of
cytochrome c in human and
chimp differs by one amino acid!
Activity: Timing
is Everything