what percent of the human population has one green eye and one blue eye?

Thank you for your interesting question.

Different color eyes are fairly rare in humans, but common in dogs such as 
Dalmatians and Australian sheep dogs, and in cats and horses. The condition is 
called "heterochromia" and it is usually benign, and frequently genetic in 
origin.

Sometimes "heterochromia" is a result of diseases such as Horner syndrome, 
Waardenburg syndrome, or piebald syndrome.

Heterochromia occurs in maybe 1 percent of the population however we need to 
bear in mind to further limit this number to humans with genetic predisposition 
to producing blue and green eyed offsprings. Therefore this should exclude 
peoples of Asian and African origin who may not be genetically predisposed to 
produce blue or green eyed offsprings.
This information was reported by StraightDope.com

Some famous people with eyes of two different colors include:
David Bowie, Christopher Walken and Kiefer Sutherland 

Definition of Heterochromia
http://www.healthcentral.com/mhc/top/003319.cfm



Definition of “somatic mosaicism” by Christopher Carlson, Grad student Genetics 
MadSci Network, Washington University

http://www.madsci.org/posts/archives/dec96/836369191.Ge.r.html

Information regarding Horner syndrome, Waardenburg syndrome, or piebald 
syndrome:

http://www.bios.niu.edu/johns/diff_eye.htm
	

Useful Background information about Eye color:

Definition and some information about eye colors:

http://www.straightdope.com/classics/a971205.html

How are Human Eye Colors inherited?:
http://www.athro.com/evo/gen/inherit1.html

Eye color genetics Calculator:
http://www.athro.com/evo/inherit.html

Figuring out how genes combine using the Punnett Square method:
http://www.athro.com/evo/gen/punnett.html

Working out Punnett Square Examples 
http://www.athro.com/evo/gen/geframe.html

Phenotypes and Genotypes for human eye colors:
http://www.athro.com/evo/gen/geframe.html

Search Terms: Eyes of two different color

://www.google.com/search?q=Eyes+of+two+different+color

Thanks again

Thank you for this answer.  I have Heterochromia iridis and was
searching the web for information; this is exactly what I was looking
for.

Thanks again!