Evidence for Evolution

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Presentation transcript:

Evidence for Evolution 7A Analyze and evaluate how evidence of common ancestry among groups is provided by the fossil record, biogeography, and homologies, including anatomical, molecular, and developmental.

Common Ancestry

Fossils

Newest or youngest fossils Fossil Record Newest or youngest fossils Oldest fossils

Biogeography

Homologous Structures

Vestigial Structures

Molecular Homologies

Developmental Homology

Phylogenetic Tree

Cladogram

Common Ancestry Group of related species all come from (with some differences) the same ancestor Ex: tigers and lions came from saber tooth cat

Fossils Preserved remains of ancient organisms Ex: dinosaur fossils

Fossil Record How species have evolved from their ancestors Ex: horse fossil record

Biogeography Study or where species now live and where they & their ancestors used to live

Homologous Structures Structures that show similarities between groups or organisms

Vestigial organs Structures that still exist in animal but no longer have any use Ex: Hind leg bones on whales Ex: Caudal vertebrae in humans (tail)

Molecular Homologies Comparing DNA & protein structures

Developmental Homology Comparing similar structures during development of embryos