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BIO - 4.2.2 Classification and Evolution > Phylogeny > Flashcards

Flashcards in Phylogeny Deck (3)
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1

What is Phylogeny?

- Phylogeny is the name given to the evolutionary relationships between organisms The study of this is called phylogenetics.
- This indicates which group a particular organism is related to, and how closely related these organisms are.
- It is the objective of many scientists to develop a classification system that correctly takes into account the phylogeny of an organism.

2

Phylogenetic trees

- Phylogenetic trees are used to represent the evolutionary relationships between organisms.
- They are branched diagrams, which show that different species have evolved from a common ancestor.
- They are produced by looking at similarities and differences in species' physical characteristics and genetic makeup.

3

Advantages of phylogenetic classification

- Classification uses knowledge of phylogeny in order to confirm the classification groups are correct.
- It produces a continuous tree whereas classification requires discrete taxonomical groups. Scientists are not forced to put organisms into specific groups.
- Hierarchal nature of classification can be misleading as it implies different groups within the same rank are equivalent even if one has a longer history than others.