17.1 The Linnaean System of Classification Updates: Quizzes resume Wednesday (4 questions) Homework: –reading Empty folders! The missing….

17.1 The Linnaean System of Classification LEQ: What are species and how are they classified? Activator: meet your cousins –What structures do squirrel monkeys have in common with humans? –Why do we share so many characteristics with squirrel monkeys? –Can you name any other primates? List them! Key terms – species, biodiversity, binomial nomenclature, taxon

17.1 The Linnaean System of Classification Healthy ecosystems often contain high biodiversity Biodiversity measures of how many different types of organisms can live in a given ecosystem –greater in areas with consistently warm temperatures. Biodiversity is greater closer to the equator. biosphere = everywhere life exists

17.1 The Linnaean System of Classification Biodiversity is valuable and important to conserve Values: –cultural and recreation –ecosystem services –biomedical applications –natural resources Understanding the relationships between organisms helps biomedical researchers narrow the list as they look for inspirations for new drugs

17.1 The Linnaean System of Classification Taxonomy: what’s in a name? Taxonomy is the science of naming and classifying organisms in a taxon. A species is one particular type of living thing: –Members of a species can interbreed to reproduce.

17.1 The Linnaean System of Classification e.g. Homo sapiens, Homo neanderthalis, Pan troglodytes Which species shares more in common? Latin scientific names always written in italics

17.1 The Linnaean System of Classification

–A genus includes one or more physically similar species. –Species in the same genus are thought to be closely related. –Physical similarities define a genus –ecology and distribution

17.1 The Linnaean System of Classification Updates: Quizzes resume Wednesday (4 questions) Homework: –reading Empty folders! The missing….

17.1 The Linnaean System of Classification Linnaeus’ classification system has seven levels.

17.1 The Linnaean System of Classification Collins type 2: Explain how classifying species using taxonomy is like a set of Russian nesting dolls:

17.1 The Linnaean System of Classification Cladistics is classification based on common ancestry. –evidence from living species, fossil record, and molecular data –shown with branching tree diagrams

17.1 The Linnaean System of Classification

Nodes represent the structure associated with the most recent common ancestor of a clade.

17.1 The Linnaean System of Classification Physical similarities are not always the result of close relationships.