what is the definition, positives, negatives, and ethical issues of genatically modify organisims?

Question

Since this is not my area of expertise, I searched Google under the key words "genetic modification advantage" to get these possible sources:

http://www.bionetonline.org/English/Content/ff_eth.htm
http://www.tki.org.nz/r/hot_topics/gm_e.php
http://scope.educ.washington.edu/gmfood/commentary/show.php?author=Vinson
http://www.ipgri.cgiar.org/institute/fact_genmod.htm
http://www.learner.org/channel/courses/biology/textbook/gmo/gmo_2.html

I hope this helps. Thanks for asking.

thank you for your help but i prefere if you send me exact short answer with maximum one page rather than web sites please