Lab #21 Evidence for
Change across Time
GOALS TODAY:
1. Share your findings with your group.
2. FINAL SUMMARY TURN INTO BASKET:
What does the evidence suggest has happened to
organisms on earth over time?
• Construct an explanation and use at least 4
pieces of evidence to defend your ideas.
Lab #21 Evidence for Evolution
4. Molecular Biology – DNA
Comparison
the more similar molecules
are between two
organisms, the more
closely related
they are.
Lab #23 Evidence for Evolution
5. Fossil Record
Fossils across continents
Same species appear to
have lived on multiple
continents
Fossils shows gradual changes throughout time of
structures
Stratification – Fossil age determined by where it
is found in sediment
Lab #21 Evidence for Evolution
6. Comparative Anatomy
Homologous Structures - Wings, hands, feet
of different species have almost identical
structures.
Lab #23 Evidence for Evolution
7. Comparative Anatomy
Vestigial Structures - Structures that seem
to do nothing for the species, but are
important in similar species
Lab #21 Evidence for Evolution
8. Embryology
The study of
developmental stages –
Vertebrate embryos that
have the same
developmental pattern
are more closely related.
Lab #23 Evidence for Evolution
9. Phylogenetic Trees or Cladograms
Illustrate evolutionary relationships based on
shared inherited characteristics.