EVIDENCE FOR EVOLUTION

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Presentation transcript:

EVIDENCE FOR EVOLUTION Fossil record Modification by descent (homologous structures) Biogeography Genetics

Fossil record The word fossil is derived from Latin and is defined as the imprint, traces or preserved remains of an organism that once lived. Do you remember how fossils are formed and dated from grade 10?

Fossils provide evidence of life’s history. The geological time scale. Trace fossil

Modification by descent (homologous structures) When there is a similarity of the formation of a body part or organ due to a common evolutionary origin, it is termed a homologous organ.

Biogeography Different but closely related species in similar biomes across the world have similar features in adapting to that biome, indicating that they probably developed from a common ancestral species Linked to continental drift.

List the sources of variation in populations. Genetics Organisms with large amounts of similar DNA sequences are more related. List the sources of variation in populations. Random assortment/segregation/ recombination of chromosomes during meiosis in the formation of gametes Crossing over Chance/random fertilisation of gametes/sexual reproduction Mutation Outbreeding/Gene flow OR meiosis