Evolutionary Trees.

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Presentation transcript:

Evolutionary Trees

An evolutionary tree represents the evolutionary relationships among a group of organisms. The pattern of branching reflects how different species evolved from a series of common ancestors.

Evolutionary relationships among organisms are based on physical features and the DNA sequences of their genes.

Two species are more related if they have a more recent common ancestor and less related if they have a less recent common ancestor.

Which is more closely related? A & B or B & C

Which is more closely related? B & D or C & E

Which is more closely related? B & D or D & E

Which is more closely related? Amphibian & Reptiles Reptiles & Mammals

Which is more closely related? Reptiles & Birds Birds & Mammals

What traits do the salamander and hamster share?