IGCSE›Cambridge IGCSE Biology›Mind mapsConcept and Uses of Classification SystemsCambridge IGCSE Biology: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsSpeciesGroup that breed to give fertile offspringSorted by shared observable and genetic featuresHorse x donkey = infertile mule, so different speciesBinomial systemTwo-part scientific name: genus then speciesGenus has a capital, species is lower caseExample: Homo (genus) sapiens (species)One international name avoids confusionDichotomous keysSeries of questions with two answersEach answer leads to another question or an identificationUse clear features: legs, body covering, presence or absenceClassificationsorting living thingsWhy classify?Shows evolutionary relationshipsRecent common ancestor = grouped closerMore similar DNA base sequences = closer relationshipDNA can correct groupings based on appearanceFive kingdomsAnimal, plant, fungus, prokaryote, protoctistAnimals: multicellular, no cell wallPlants: cell wall, photosynthesiseProkaryotes: single-celled, no true nucleusProtoctists: mostly single-celled, has nucleusExam tipsViruses are not a sixth kingdomVirus = protein coat + genetic materialReclassified? Answer DNA evidence