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i. introduction
i. introduction

... a) Introduced the idea of natural selection as the driving force of evolution 4. Gregory Mendel a) Introduced the idea of genes as the mechanism of transmission of traits B. Observation and Inferences by Charles Darwin 1. Observation 1 a) All species produce more offspring then the environment can s ...
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adaptation adaptive radiation analogous structure artificial selection
adaptation adaptive radiation analogous structure artificial selection

... increases an organism’s chance for survival. A single species evolves into different forms due to natural selection and various forms of isolation. Structures with similar functions that did not come from a common ancestry, but from sharing a similar environment. Selection caused by humans (also cal ...
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File

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Outline for Jan. 17

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... 3. Describe the three main sources of variation within a population. 4. If a trait increases an organism’s ability to survive but NOT its ability to reproduce is that organism have a high “fitness”? Explain 5. Draw the bell curve that represents traits for most populations. One the same graph using ...
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THE THEORY OF EVOLUTION

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... is the evolution of a new species from an existing species.  Speciation can occur when the environment changes.  When genetic changes within two groups of the same species build up, the two groups may not be able to interbreed anymore.  When this happens, two different species have formed and spe ...
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Adaptation, natural selection and speciation
Adaptation, natural selection and speciation

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Speciation



Speciation is the evolutionary process by which new biological species arise. The biologist Orator F. Cook was the first to coin the term 'speciation' for the splitting of lineages or ""cladogenesis,"" as opposed to ""anagenesis"" or ""phyletic evolution"" occurring within lineages. Charles Darwin was the first to describe the role of natural selection in speciation. There is research comparing the intensity of sexual selection in different clades with their number of species.There are four geographic modes of speciation in nature, based on the extent to which speciating populations are isolated from one another: allopatric, peripatric, parapatric, and sympatric. Speciation may also be induced artificially, through animal husbandry, agriculture, or laboratory experiments. Whether genetic drift is a minor or major contributor to speciation is the subject matter of much ongoing discussion.
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