Natural Selection

Natural Selection - Natural Selection & Complex Traits...

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Quantitative, or measurable traits Normally distributed o Central tendency (mean) o Regular (predictable) variation Natural selection may change: o Location of distribution (central tendency) o Amount of predictable variation Modes of Selection o Directional selection Distribution of complex trait, such as stature Center of the bell curve Population mean, (mu (u with hook)) Selection against the shortest phenotypes Distribution of trait after selection New population mean Selection for taller humans o Stabilizing selection Selection against the shortest and tallest phenotype End up with new distribution, but the means are the same, but the variance is decreased o Disruptive selection Selection pressure applied to center (average) of distribution Two new distributions Disruptive selection resulting in speciation Selection pressures
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New species?
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Natural Selection - Natural Selection & Complex Traits...

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