Artificial selection

N.p., n.d. Web. 17 Oct. 2013

http://evolution.berkeley.edu/evolibrary/article/evo_3

"Artificial Selection." Artificial Selection. N.p., n.d. Web. 17 Oct. 2013.

http://www.princeton.edu/~achaney/tmve/wiki100k/docs/Artificial_selection.html

Artificial Selection is when man controls the animal for farming, ranching, ect. They breed and control what is wanted for a specific trait. For example, removing a calf from the group for a condition that limits their weight gain.

Natural Selection is when environmental Conditions determine which combination of alleles (genotypes) will survive and reproduce.

For natural selection to occur:
1. Variation in a population must exist
2. Variation results in differences in offspring survival
3. Variation is due to inheritance