Lecture 020 - Genetic Variation

Lecture 020 - Genetic Variation - Lecture outline genetic...

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1 Bio1222 Lecture outline: genetic variation Lecture outline: genetic variation What is it and why does it matter? Selection: does it always reduce genetic variation? Other evolutionary mechanisms: –M u t a t i o n –M i g r a t i
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2 Bio1222 Why does it matter? Why does it matter? Bio1222 Why is there (usually) so much? Why is there (usually) so much? • Classical model of variation – Any allele is either helpful or harmful – selection should eventually replace bad with good alleles – So, genetic variation should be rare and temporary • But, most natural populations contain lots of GV… ???
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3 Bio1222 Selection: does it always reduce variation? Selection: does it always reduce variation? • Environment (and the direction of selection). .. Bio1222 Selection: does it always reduce variation? Selection: does it always reduce variation? • Environment (and the direction of selection)…
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4 Bio1222 Selection: does it always reduce variation? Selection: does it always reduce variation?
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Lecture 020 - Genetic Variation - Lecture outline genetic...

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