A-Level Biology AQA Notes

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Classification

The Biological Species Concept- a species contains all organisms that are capable of breeding together to produce living, fertile offspring.
Courtship and mating behaviour are a vital part of species survival. Courtship behaviour enables individuals to: recognise same species members & identify mate capable of breeding
Classification is the process of sorting living things into groups.
Classification hierarchy comprises the taxa: domain, kingdom, phylum, class, order, family, genus and species.

Classifications are constantly updated as new methods are discovered to infer relationships e.g. DNA sequencing, amino acid sequencing or immunological comparisons.
The binomial naming system names species by their genus and species name.
Phylogeny is the study of evolutionary relationships between organisms.
In a phylogenetic diagram, branch tips represent species at the end of their specific lineage, branching points represent common ancestors & The closer the branches, the closer the evolutionary relationship.

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