Binomial Naming System

Part of Classification · Section 3 of 11

Key FactsUnit: Inheritance & EvolutionGCSE

This key facts covers Binomial Naming System within Classification for GCSE Biology. Classification systems, taxonomy, and evolutionary relationships It is section 3 of 11 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.

Binomial Naming System

  • Two-part Latin name: Genus + species
  • Written in italics or underlined
  • Genus has capital letter; species is lowercase
  • Example: Homo sapiens (humans)

Visual: Classification of Living Organisms

Classification diagram showing the taxonomic hierarchy (Kingdom, Phylum, Class, Order, Family, Genus, Species), human classification example, the five kingdoms, and binomial naming system

Remember: King Philip Came Over For Good Spaghetti | Binomial name = Genus species (italicised)

Visual: Evidence for Evolution

Painted evolution evidence: LEFT fossil record showing rock strata with progressively more complex fossils from bottom to top (bacteria, fish, amphibian, modern animal); RIGHT homologous structures showing human arm, whale flipper, bat wing, cat leg all with the same underlying bone pattern, suggesting common ancestry.

Remember: 5 types of evidence: Fossils | Comparative anatomy | DNA similarity | Embryology | Observed resistance

Visual: Speciation

Painted 4-stage speciation through geographic isolation: (1) single bird population in one habitat, (2) geographical barrier (river or mountain) splits the habitat, (3) isolated populations evolve different beak shapes / colours due to different selection pressures, (4) two distinct species that no longer interbreed even if reunited.

Remember: Isolation → Different mutations + Different selection → Genetic changes → Can't interbreed = NEW SPECIES

Practice questions for Classification

What is the highest level in the Linnaean classification system?

  • A. Species
  • B. Kingdom
  • C. Phylum
  • D. Class
1 markfoundation

What is the purpose of classifying living things based on their DNA and genome characteristics?

2 marksstandard

Quick recall flashcards

What is biological classification?
The process of sorting organisms into groups based on shared characteristics and evolutionary relationships. Classification helps scientists name, study, and communicate about the huge variety of life on Earth.
How do you correctly write a binomial (scientific) name?
Genus name first with CAPITAL letter, species name second in lower case — e.g. Homo sapiens. Both words are italicised when typed or underlined when handwritten. Example: Felis catus (domestic cat), Panthera leo (lion).

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