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Classification and evolution 4.1.3

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Detailed notes on classification and evolution, including natural selection, adaptations and statistical tests. Notes written using OCR Biology A textbooks, past papers and more. Written by a student with all A*s at GCSE with an offer for Natural Sciences at Cambridge.

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  • January 25, 2020
  • 7
  • 2018/2019
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4.2.2 Classification and evolution
(a) the biological classification of species
Taxonomic Groups

Domains: Archaea, Bacteria, Eukaryotae
Kingdoms: Plantae, Animalia, Fungi, Protoctista, Prokaryotae
Phylum: organisms of the same body plan (vertebrae)
Class: organisms with the same general traits (no. of legs)
Order: sub-division of characteristics (herbivora)
Family: closely related genera e.g. dogs and cats
Genus: very closely relates species
Species: all members are basically the same with a few variations
and can breed with each other to produce fertile offspring

(b) the binomial system of naming species and the advantage of such a
system
Binomial System
Binomial system: a system that uses the genus and species to avoid confusion when naming
organisms. Devised by Carl Linnaeus.

Rules:
- Written in italics or underlined when handwritten
- Genus must be capitalised, and the species is lower-case
E.g. Homo sapiens

Advantages:
• Universal to all countries where common animal names are likely to be different
• Avoids confusion between different species with the same common name

(c) (i) the features used to classify organisms into the five kingdoms:
Prokaryotae, Protoctista, Fungi, Plantae, Animalia
Kingdom Examples Features
Prokaryotae Bacteria • No nucleus (plasmids and loops of DNA)
• No membrane-bound organelles
• Smaller ribosomes
• Smaller cells
Protoctista Algae, protozoa • Mostly single-celled
• Wide variety of forms (plant or animal like)
• Autotrophic or heterotrophic nutrition –
photosynthesis, ingestion, saprotrophic nutrition
Fungi Mould, yeast, • Can be single celled (yeast) or multicellular
mushroom • Chitin cell wall
• Multinucleate cytoplasm
• Saprophytic
Plantae Moss, fern, • Multicellular
flowering plants • Cellulose cell wall
• Autotrophic (photosynthesis with chlorophyll)
Animalia Insects, fish, birds, • Multicellular
mammals, reptiles • Heterotrophic (digest large molecules to smaller
ones

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