Evidence for evolution Darwin’s key ideas: A. REPRODUCTION: Organisms produce more offspring than can survive B. VARIATION:Variety in traits exist C.

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Presentation transcript:

Evidence for evolution

Darwin’s key ideas: A. REPRODUCTION: Organisms produce more offspring than can survive B. VARIATION:Variety in traits exist C. SURVIVAL OF THE FIT: Some traits allow survival & are passed on D. Over time certain variations make up most of a population & they may be different from their ancestors

Evidence for Evolution 1. Fossil record 2. Comparative anatomy 3. Comparative embryology 4. Comparative biochemistry 5. Plate tectonics

Fossil Evidence : Remains of once living organisms provide evidence of change over time. Limited: 1. Type of material preserved (bone, shell, impressions, amber) 2. Incomplete record 3. Easily disrupted

Plant Fossil Evidence:

Law of superposition

Comparative Anatomy: Structural similarities link related species

Homologous Structures: Same underlying structures, different functions, different environments & common ancestor

Homologous structures in plants

Vestigial Structures Structures that are present in an organism but are reduced in size and either have no use or have a less important function than they do in other related organisms.

Snake Human

Comparative embryology : Similar embryo development in closely related species

5.Comparative Biochemistry Similar DNA sequences code for similar traits in closely related species.

Plate Tectonics (Geographical distribution) Continental masses were one land mass

Closely related species have common ancestors on now separated continents