The origin of morality

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Prove it.

http://en.wikipedia.org/wiki/Morality

Tribal and territorial

Celia Green made a distinction between tribal and territorial morality.[9] She characterizes the latter as predominantly negative and proscriptive: it defines a person’s territory, including his or her property and dependents, which is not to be damaged or interfered with. Apart from these proscriptions, territorial morality is permissive, allowing the individual whatever behaviour does not interfere with the territory of another. By contrast, tribal morality is prescriptive, imposing the norms of the collective on the individual. These norms will be arbitrary, culturally dependent and ‘flexible’, whereas territorial morality aims at rules which are universal and absolute, such as Kant’s ‘categorical imperative’ and Geisler's graded absolutism. Green relates the development of territorial morality to the rise of the concept of private property, and the ascendancy of contract over status.

From the viewpoint of evolution:

The development of modern morality is a process closely tied to the Sociocultural evolution of different peoples of humanity. Some evolutionary biologists, particularly sociobiologists, believe that morality is a product of evolutionary forces acting at an individual level and also at the group level through group selection (though to what degree this actually occurs is a controversial topic in evolutionary theory). Some sociobiologists contend that the set of behaviors that constitute morality evolved largely because they provided possible survival and/or reproductive benefits (i.e. increased evolutionary success). Humans consequently evolved "pro-social" emotions, such as feelings of empathy or guilt, in response to these moral behaviors. Conversely, it has been argued by other biologists that the humans developed truly moral, altruistic instincts.[15]