QUIZ What is the science that describes, names and classifies organisms? Linnaeus classified organisms according to their ______ & ______. (True or False) Binomial nomenclature gives the phylum and genus names. What is the species name for humans?

The science of organizing life Taxonomy The science of organizing life Taxon (taxa plural) - groups within a taxonomic system

Linnaean System Group organisms into levels according to their visible form & structure

ACTIVITY 1 Classify Objects by Characteristics

Spider Key

Kingdom Phylum Class Order Family Genus species

King Phillip Came Over For Ginger Snaps

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Linnaean System Binomial Nomenclature Developed a 2 - part naming system called Binomial Nomenclature Genus name followed by species identifier Written in italics Genus name capitalized Latin roots & descriptive name example: Homo sapiens Subspecies (variations of a species living in different areas) name follows species identifier

Systematics Describing, classifying and naming organisms in terms of their natural relationships Natural relationships = physical features, embryos, genes in the nucleus, DNA & RNA Biologist can choose & combine systems of classification but the classification should reflect Phylogeny

Hypothesis of the evolutionary history of species or taxonomic group What is Phylogeny? Hypothesis of the evolutionary history of species or taxonomic group Phylogenetics – the evolutionary relationships among organisms; Compare visible similarities among current living or fossils or compare chromosomes and macromolecules Represent hypotheses in the form of phylogenetic diagram also called phylogenetic tree

Activity 2 Create a Phylogenetic tree Family tree you – parents- grand parents- great grandparent & so on. What natural relationships does your tree represent?

Systematics Compares homologous features items that share a common ancestry Important to separate from analogous features similar because they have similar function The greater the number of homologous features shared by two organisms the closer they are related

Homologous vs. Analogous 15

CLADISTICS A phylogenetic classification system that uses shared derived characters & ancestry as the only criteria for grouping taxa Shared character – feature that all members of a group have in common Derived character – feature that evolved only within the group under consideration

CLADISTICS Clad – group of organisms that include an ancestor plus all of its descendants Cladograms – phylogenetic diagrams

CLADOGRAMS

Cladogram Group

ANY QUESTIONS?

Answers Question 1- 6 on Page 345 HOMEWORK READ p 341 – 345 Answers Question 1- 6 on Page 345