(c) Selection. Natural selection is the non-random increase in frequency of DNA sequences that increase survival. Sexual selection is the non-random increase in frequency of DNA sequences that increase reproduction. The differences in outcome as a result of stabilising, directional and disruptive selection.
(d) Genetic drift. The random increase and decrease in frequency of sequences, particularly in small populations, as a result of neutral mutations and founder effects.
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Selection in Peppered Moths
Click the icon to access an interactive presentation about Dr Kettlewell’s experiments on natural selection in the peppered moth.
Sexual Selection
This webpage offers a concise and clear explanation of the significance of female choice in sexual selection.
http://evolution.berkeley.edu/evosite/evo101/IIIE3Sexualselection.shtml
The subsequent article may answer some questions regarding the evolution of apparently disadvantageous traits and the mechanisms by which they can evolve a role in sexual selection. http://evolution.berkeley.edu/evosite/evo101/IIIE3aRunawayselec.shtml
This video discusses the role of sexual selection in the evolution of species.
Watch Richard Dawkins on Sexual Selection in Educational & How-To | View More Free Videos Online at Veoh.com
Stabilizing, Disruptive & Directional Selection.
The slides on the following link explain these three types of selection. http://www.execulink.com/~ekimmel/natural_selection.htm
