Tuesday, June 22, 2010

How do genes work with eye color?

Both my parents have medium brown hair and piercing, crystal clear blue eyes, to die for. I got that gene, but both my brothers (my twin and my 3 year old brother) have more brownish eyes. Nobody in the immediate family has brown eyes. How'd they wind up with this gene?How do genes work with eye color?
We have different alleles for any of genes ! for your eye genes may be your parents are hetero zygotes and some of their children phenotypes showed dominant allele phenotype ( like you ! ) and some of theme showed recessive ( like your twin and other bro )How do genes work with eye color?
The gene for eye color isn't as simple as 'here's a gene for brown eyes, and another one for green, and another one for hazel' etc. The gene for eye color doesn't carry a specific color, but amounts of pigments, called melanin. If the genes are carrying a lot of pigments, then their eye color will be darker, like brown. If the genes are carrying only a few pigments, then the eye color will be lighter, like blue. If the colors are somewhere in between (or one gene has a lot of pigment and another has almost no pigment) then they mix and because shades of color in the middle, like green, hazel, light brown and dark blue, etc.
Well the darker the more chances. Everyone carries genes from WAAAAY back, chances are that someone way back on both sides had dark eyes.

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