Sources of Variation
Genetic mutations arise in response to the environment.
Genetic mutations are constantly occurring. Depending on the environment, mutations can be good, bad, or neutral.
Barton, N. H., Briggs, D. E. G., Eisen, J. A., Goldstein, D. B., & Patel, N. H. (2007). Evolution. Cold Spring Harbor Laboratory Press: Cold Spring Harbor, New York.
Sturm, R. A. (2009). Molecular genetics of human pigmentation diversity. Human Molecular Genetics, 18 (R1), R9-R17.
Funding provided by grant 51006109 from the Howard Hughes Medical Institute, Precollege Science Education Initiative for Biomedical Research