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Modern Taxonomy

Explore how life is classified today using fossils, living specimens, and molecular data. Learn about evolutionary histories, common ancestry, and derived characters in Cladistics. Discover the importance of DNA and chromosome evidence in determining species' relatedness and classifications.

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Modern Taxonomy

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  1. Modern Taxonomy

  2. How is Life Classified Today? • Similar traits often indicates common ancestry • Phylogeny: evolutionary histories of a species • Determined by examining: • Fossils • Living specimens • Molecular data • Development Despite the physical differences, which group of life do these belong to?

  3. Fossil Evidence • Homologous structures: body parts that have a similar structure, but different function • Relationships identified among different species • Fossils link past life to modern life

  4. Anatomy shows nonrelationships also Dolphins are not FISH! Despite their outer Physical appearance

  5. Biochemical Evidence • Comparing DNA, amino acids, chromosomes, proteins • Similarities and differences can be found • Splits in evolution can be estimated

  6. Chromosome Evidence Chromosome order: Human, orangutan, gorilla, pygmy chimp

  7. Molecular evidence reveals species’ relatedness. • Molecular data may confirm classification. • Molecular data may lead scientists to propose a new classification. • DNA is usually given the last word by scientists.

  8. Cladistics • Cladistics is a common method to make evolutionary trees. • classification based on common ancestry • species placed in order that they descended from common ancestor • Shown in tree branching diagrams

  9. 1 Tetrapoda clade 2 Amniota clade 3 Reptilia clade 4 Diapsida clade 5 Archosauria clade FEATHERS & TOOTHLESS BEAKS. SKULL OPENINGS IN FRONT OF THE EYE & IN THE JAW OPENING IN THE SIDE OF THE SKULL SKULL OPENINGS BEHIND THE EYE EMBRYO PROTECTED BY AMNIOTIC FLUID FOUR LIMBS WITH DIGITS DERIVED CHARACTER • A clade is a group of species that share a common ancestor. • Derived characters: • represented on cladogram as hash marks • more closely related species share more derived characters CLADE • Nodes represent the most recent common ancestor of a clade. NODE

  10. List 2 characteristics of a salamander. Where would a 3rd be located? • From the diagram, which organism is most closely related to the Chimp?

  11. 1) What does an amphibian & crocodile have in common? Vertebrae, Bony skeleton, Four limbs • 2) List the traits of a ray-finned fish. Doesn’t have 4 limbs, has bony skeleton, has vertebrae

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