Evolutionary Evidence

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Presentation transcript:

Evolutionary Evidence Fossil record Comparative anatomy Comparative Embryology Comparative Biochemistry Geographic distribution

Fossil Record Remains of once living organisms. Found in sedimentary rock. Simpler forms of life at bottom. Limited: Type of material preserved (bone, shell, impressions, amber) Incomplete record Easily disrupted

Comparative Anatomy Homologous structures Vestigial structures

Homologous Structures

Vestigial Structures Human Salamander, Whale, Boa Functional limb on salamander is probably Similar to the limb of common ancestor.

Comparative Embryology (Early 1800’s) 2006 UCBerkeley

Chick Embryo vs. Human Notice the human embryo has gill slits. 2006 UCBerkeley Notice the human embryo has gill slits.

Comparative Biochemistry Similar DNA Sequences Similar Gene segments of the DNA Code for similar traits in closely related species

Similar DNA In Organisms DNA Sequencing- 0.1% difference between any person. - 1.5% between human and chimp. . 2006 UCBerkeley