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Applying the Linnaean system to classification

Inheritance, variation and evolution • Classification of living organisms

Key concepts

What you'll likely be quizzed about

  • Taxonomic classification bestows a structure, arranging groups from broad to narrow: kingdom, phylum, class, order, family, genus, species.
  • Each lower rank includes organisms that share specific characteristics.
  • For instance, the genus Panthera encompasses big cats with close structural traits, while the species name identifies distinct species within that genus.

Flashcards

Test your knowledge with interactive flashcards

What information from an evolutionary tree helps assign species to a genus?

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Branch proximity and shared nodes indicate recent common ancestry, guiding assignment based on relatedness.

Key notes

Important points to keep in mind

Hierarchy: Kingdom → Phylum → Class → Order → Family → Genus → Species.

Binomial names: Genus (capitalized), species (lowercase), italicized or underlined when handwritten.

Abbreviate genus after first full appearance, ensuring no confusion with other genera.

Species defined by the ability to interbreed and produce fertile offspring.

Use shared diagnostic traits for grouping; more traits lead to narrower ranks.

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