1. Catalyst: If the answer is False, explain why.
1. True or false. Populations tend to be stable
2. True or false. All individuals in a species
are exactly alike.
3. True or false. Different traits can be
4. True or false. Resources are unlimited.
5. True or false. Natural selection is when
organisms with superior traits survive to
pass those traits onto offspring.
3. 5 areas of scientific study provide evidence for
1.) Fossil Record
2.) Comparative Anatomy
3.) Comparative Embryology
4.) Molecular Biology
4. Fossil Record
• The progression of
forms observed in
the fossil record is
about the major
descent in the tree
6. • The Darwinian view of
– Predicts that
should leave signs in
the fossil record
– Have discovered
fossils of many such
7. Comparative Anatomy
The study of anatomical structures and
• Homologous structures
• Analogous structures
• Vestigial structures
8. Comparative Anatomy
• Homologous structures: are anatomical
resemblances between organisms that represent
variations on a structural theme that was present in
a common ancestor
Human Cat Whale Bat
9. Comparative Anatomy
• Analogous structures: superficial similarities
that reflect an adaptation reflective of similar
environments, not a descent from a common
11. Comparative Embryology
• Closely related organisms go through similar
stages in their embryonic development.
• All vertebrate embryos go through a stage in
which thy have gill pouches and tails.
12. Molecular Biology
• Scientists examine the nucleotide of DNA
and amino acid sequences of proteins from
different species. Closely related species
share higher percentages of sequences
than species that are distantly related.
18. Connection: Biogeography and Comparative
• Types of comparative anatomy can also be
classified as convergent and divergent
evolution, which structure is an example of
divergent evolution? Convergent evolution?