Title: What is taxonomy
1What is taxonomy based on?
Fossils Embryology Homologous parts Vestigial
Parts Biochemistry
2Taxonomy a branch of biology which groups and
names organisms based on characteristics and
evolutionary history ( phylogeny )
3Fossils
4Belemnites
5Comparative Embryology
6Similarities in embryos reflect common ( the
same ) ancestry.
7Homologous Structures are body parts that have
the same general structure but may be used
for a different functions.
Bird wing / mans arm / dogs front leg
8Homologous Structures
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11- Vestigial Body Parts
- body structures that are
- reduced in size
- no longer/ less useful
- leftover from evolution
- from ancestors
Human tailbone
12appendix
coccyx
13Gill slits
tail
Human embryo
14Similarities in DNA and proteins
15Two organisms are closely related in evolution
if their DNA and proteins are similar. (
biochemical similarities are evidence for
common ancestry )
16Man vs chimp
98 genetic similarity
17Ammonite
Pseudomorph - total replacement of original
components
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19Insect in amber
20Minerals in bone are replaced by other minerals
to male stone
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