Originally posted by zeeblebot
Ask a Geneticist
by Dr. Barry Starr, Stanford University
Can a couple (one with straight hair, one with curly) have one straight haired child and one curly haired, and one of the children has green eyes and the other blue? Both parents have green. Is this possible?
.... (answer) ...
A person with green eyes will have two blue bey2 genes, because any other combination of bey2 genes would give brown eyes.
The greenness comes from the gey gene (adolescent snickering encouraged). Each parent has at least one green gey gene. The other might be green or blue.
If each parent has only one green gey gene, the child could come out with blue eyes or green eyes.
While researching the hair question, I found Dr. Starr's answer, which would be pointless to repeat here as you left it out intentionally. However I will point out that he says green eyed parents can have a brown eyed child rarely, which suggests my model of the genetics is simplified and that there's more going on.