Phylogeny

Question 1

What is phylogeny?

Answer 1

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Question 2

Relationship between classification and Phylogeny

Answer 2

• classification is placing living organisms into categories based on sim
• Phylogeny is the evolutionary relationship between organisms. It reveals what group an organism is related to and how closely related organisms are.
• modern classification reflects phylogeny

Question 3

What is an advantage of phylogenetic classification?

Answer 3

• continuous tree that doesn’t force organisms into specific taxonomic groups where they don’t quite fit.
• no overlap between the groups produced so not misleading like Hierarchy of Linnaean as two groups in same level are the same.

Question 4

What are phylogenetic trees?

Answer 4

• map evolutionary relationships between organisms and their histories
• relative positions of branching points show distance of shared common ancestors.
• relative distances between vertical lines shows closeness of species’ evolution from common ancestral branches.
• proximity of species to each other indicates the closeness of their evolutionary relationship.

Question 5

What does phylogeny indicate over time?

Answer 5

• indicates lines of descent and divergence
• oldest species is shown at the left of the tree
• most recent species are shown at the ends of the branches (right).