|MadSci Network: Genetics|
Jill, You have a very good question. However, it is not very easy to answer. To date there are three genes know to control eye color. Each gene does not conrol a specific color. For example, the two genes on chromosome fifteen control different color. One controls blue and brown while the other controls central brown. The third gene on chromosome 19 controls blue and green eye color. Therefore it is very difficult to give a specific percentage unless there has been a study of individuals and their offspring. However, this study must only look at phenotypes (expressed characteristics) instead of genotypes. I have attached a website that shows some complexities to answering your question. Sincerely, Mike http://www.seps.org/cvoracle/faq/eyecolor.html
Try the links in the MadSci Library for more information on Genetics.