I had a look at the above link and found the following quote, which is incorrect:

"The laws of genetics state that eye color is inherited as follows:

If both parents have blue eyes, the children will have blue eyes.

If both parents have brown eyes, a quarter of the children will have blue eyes, and three quarters will have brown eyes.

The brown eye form of the eye color gene (or allele) is dominant, whereas the blue eye allele is recessive."

This is not quite accurate and I think what they really meant was:

If both parents have brown eyes, and each one has a parent with blue eyes (and therefore have heterozygous recessive genes for blue eyes) then they will have a 1 in 4 chance of producing a child with blue eyes.

But if both (brown-eyed) parents each have 2 brown eyed parents themselves, they will be carrying homozygous dominant genes for brown eyes - and they will produce - with certainty (barring spontaneous mutations) brown eyed offspring.

If 1/4 of the offspring of 2 brown-eyed parents had blue eyes, as the quote from the link claims, there would be a lot of blue-eyed people in non-white populations.

It requires 2 blue-eyed grandparents - one from the maternal and one from the paternal side - for 2 brown-eyed people to produce a blue-eyed offspring.

And that means a 1 in 4 chance of producing a blue-eyed child, not that 1/4 of your children will be blue-eyed. Big difference, important in genetics, statistical analysis and gambling.

2 blue-eyed parents will have homozygous recessive genes for blue eyes, and can only (barring mutations) produce blue-eyed offspring.

Phenotype = expressed form of the gene, i.e. what you see. Genotype = genetic type you don't see,
as in brown eyed person carrying gene for blue eyes.

In the case of a blue-eyed person, their phenotype (for eye-colour anyway) is the same as their genotype.

Having quoted my junior-high genetics lesson, I have to say an opthamologist friend of mine once told me this is a vast oversimplification of the genetics and that 8 other genes were involved in determining eye colour and the old high-school genetics formula isn't really entirely reliable; but the above quote from the link is just plain wrong.

But it's interesting that Helen Clark is more attractive to blue eyed men than Penelope Cruz. I wouldn't have thought so, but you learn something every day.