2007-01-10 14:25:15 · 29 answers · asked by Scott O 1 in Science & Mathematics ➔ Medicine
It's possible.
2007-01-10 15:14:30 · answer #1 · answered by The Notorious Doctor Zoom Zoom 6 · 0⤊ 0⤋
Yes it is possible. Really eye color is a polygenic trait, meaning more than 1 gene (3 i think) contribute to eye color. Also the color of eyes does not follow simple Mendelian genetics. It simplifies things to say that brown is dominant and blue is recessive because generally that is the case.
Not everything is life is as simple as just recessive or dominant. Genetics can be quite complex, and when you have several genes playing a role on a trait, its difficult to predict what the trait will be. You can't just do a punnett square with 2 alleles bb vs bb to get the answer. There are at least 3 genes (6 alleles!) to contribute to eye color (and those are just the ones known). You can see how you could get several combinations. Then when you account for the non-Mendelian genetics where you can get blending of colors, etc. etc.
So yes it is possible to have brown eyes if both parents have blue.
2007-01-10 14:42:44 · answer #2 · answered by Anonymous · 0⤊ 0⤋
No. The genes for brown eyes are dominant. Blue eyes are a recessive trait. If both parents had blue eyes, then neither of them possess the trait for brown eyees, and theycouldn't have produced a brown-eyed offspring. If I were the father, I'd be having a long talk with the brown-eyed mailman.
2007-01-10 14:31:03 · answer #3 · answered by baka_otaku30 5 · 0⤊ 0⤋
Yes. Eyecolor is determined by several pairs of alleles that assort over about eigth hues of eye color, from pale blue to dark brown. If both parents are 3/4 or 7/8 blue, there is a chance that their offspring may have darker eyes than either parent.
2007-01-10 14:45:57 · answer #4 · answered by Jerry P 6 · 0⤊ 0⤋
Eye color is a complicated trait involving 3 genes. (this is an incomplete model though). The genes for blue eyes are recessive so, if mom has blue and dad has blue they have blue-blue/blue-blue genes....so they can have blue eyed kids.
Now does one have light green/almost blue?
Then it gets complicated!
Check out the link below it have an interactive calculator of eye color!
"The known Human Eye color genes are: EYCL1 (also called gey), the Green/blue eye color gene, located on chromosome 19 (though there is also evidence that another gene with similar activity exists but is not on chromosome 19). EYCL2 (also called bey1), the central brown eye color gene, possibly located on chromosome 15. EYCL3 (also called bey2), the Brown/blue eye color gene located on chromosome 15. A second gene for green has also been postulated. Other eye colors including grey and hazel are not yet explained. We do not yet know what these genes make, or how they produce eye colors. The two gene model (EYCL1 and EYCL3) used above explains only a portion of human eye color inheritance. Both additional eye color genes and modifier genes are almost certainly involved."
2007-01-10 14:37:13 · answer #5 · answered by Dr. Jon 3 · 2⤊ 0⤋
No.
The human gene for brown eyes is dominant, and blue eyes are recessive. You have two genes for eye color, if there is a mix,
the dominant one takes over. Hence,
Brown+Brown = Brown.
Brown+Blue = Brown.
Blue + Brown = Brown.
Blue + Blue = Blue.
If both your parents have blue eyes, they only have
blue eye color genes to give you. You get one from
each parent.
I use "you" here as a convenience. I'm not saying
anything about you or your parents. Good luck.
2007-01-10 15:03:35 · answer #6 · answered by robabard 5 · 0⤊ 0⤋
About 1 in 1,000,000.
Blue eyes are recessive genes. That means if either parent had anything but blue, your eyes would be that other color.
Of course, the sponaneous mutation rate is 1 in 1,000,000 and you could be a rare exception.
In the hospital were I work, 1 in 4 family members volunteering for organ donation to another family member is actually found to be unrelated -- meaning daddy wasn't daddy. In Vegas, I would bet against mutation every time. Infidelity is a much more likely explanation.
If you're not sure, get a genetics book and confront your mother with it. (Or your wife, if that's the case.)
Good luck and sorry for the bad news.
2007-01-10 14:29:01 · answer #7 · answered by Ignoramus 3 · 3⤊ 1⤋
No. Blue eyes are the result of a recessive gene. To have blue eyes, you must have two recessive alleles, and no brown eye dominant genes. However, since this doesn't follow simple genetics, there is a very slight chance, about 1 in 100,000,000 cases.
2007-01-10 14:30:48 · answer #8 · answered by bibliomaniac15 3 · 1⤊ 1⤋
Yes it is. The color of a person's eyes depends on the genes that are passed along from both parents. If both parents carry the gene for brown eyes, it is possible that they will produce a child that has brown eyes.
2007-01-10 14:29:23 · answer #9 · answered by J 2 · 1⤊ 2⤋
Not possible. Blue eyes are a recessive gene and if both parents have that trait, their DNA carries ONLY blue eyes. If one parent even had one brown gene in them, their eye color would be brown because brown is dominant. They only gene they can pass on to their child is therefor, blue.
2007-01-10 14:30:38 · answer #10 · answered by Tiffany* 5 · 1⤊ 2⤋
NO it is not possible for a child of two blue eyed parents to have a brown eyed child. this is actually the only situation in terms of eye color where it is really this cut and dry. two browns can have any color two greens any color and any combo of any of these could have any color due to genes, but again the way that I learned it in college is two blues equal blue period. if you would like some more info I would go to any web site where it talks about your basic antatomy and phy. I learned this little bit of info in my first class on the basic principles
2007-01-10 14:37:27 · answer #11 · answered by Jeff S 1 · 1⤊ 1⤋