Darwinian Theory

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Biological Evolution

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PAPER 4

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SICKLE CELL ANEMIA

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Evolution: Natural Selection

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Darwinian Theory

Evolution and the process of science

Test the hypothesis

hypothesis

Communication to other scientists

Observation and Description

He was born on February the 9th 1809

He died on April the 19th 1882

Evolution is considered science because it is observable and testable

Genetic mutation

Artificial selection in the laboratory.

Study of living species

The Fossil record

Species

Speciation is the evolutionary process by which new biological species arise

a group of related organisms that share a distinctive form and are capable of interbreeding and producing an offspring that interbreeds

Natural Selection

Evolution shows us that species are not immutable but that they change over time through natural selection

the process by which new species were brought into existence.

Evolution according to Darwin was studied on four scales

Chemical

Biological

Geological

Astronomical