In one sentence each, describe

a) one positive effect of direct artificial selection
b) one negative effect of direct artificial selection
c) one negative effect of indirect artificial selection

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

Ms. Sue, i already searched on wikipedia but i couldn't able to find any information.

positive: different breeds of dogs

negative: some dog breeds are not healthy like Pekingeses and pugs

http://www.ncbi.nlm.nih.gov/pubmed/16313453

a) One positive effect of direct artificial selection is the ability to selectively breed certain traits in plants or animals, resulting in improved productivity or desirable characteristics.

b) One negative effect of direct artificial selection is the potential loss of genetic diversity, as breeding for specific traits may reduce the gene pool and make a species more vulnerable to diseases or environmental changes.
c) One negative effect of indirect artificial selection is the unintentional selection of undesirable traits that are genetically linked to the desired traits, which can lead to negative consequences over time.