quick question, that website did not include hazel eyes. what happens when a parent has hazel eyes? i'm trying to get a better understanding for how it works i guess.
That website listed doesn't explain lots of things and honestly, you'd need a full course in genetics to understand it all - I've even had that full class and then many others and I don't always understand it. Genes are complicated little buggers with so many tricks!
But the more complicated/less simplified version of eye color genetics is:
There are 3 known genetic loci (genes) that control eye color. How all 3 of these interact is what determined what color the eyes will be. For example, albinism...albinos may technically have the genes for brown hair, brown skin, brown eyes, but another gene "turns off" the genes to make those pigments...no pigment is made and the person appears "albino". See what I mean about various genes controlling one trait?
On to hazel...technically, they do not know what causes hazel eye color...but the 2 main genes that control eye color operate on a spectrum...light blue to dark brown. Green and hazel are in between on the spectrum, so they suspect it is inherited on a sort of sliding scale. I don't know that this is how eye color works (nor do the experts), but it is possible that it is something like height...
Mom is of shorter than average height. Her genes would look something like this...
TTTTTttttttttttttttt
Dad is of average height.
TTTTTTTTTTtttttttttt
Offspring would inherit 10 of the Ts from mom and 10 Ts from dad. Any 10.
So, one offspring could get all short ts from mom. tttttttttt And all short ts from dad. tttttttttt
So, offspring could be really, really short. tttttttttttttttttttt
The next offspring could be really tall. TTTTTtttttTTTTTTTTTT.
Now, that is really oversimplifying as well, but eyecolor most likely works this way as well. It all depends on the combinations received...and then on the accessory genes that could override that information.