I don't understand how that can be, because I know for Chinese people the dominant eye colour is dark brown, is it something with her genes? Is there a possibilty she is mixed?
She told me that out of her 6 siblings, she was the only one that got blue eyes and she told me her father had blue eyes too.
Plus, everyone made fun of her when she was younger because she looked like a mix of Chinese and Caucasian, people still thinks she's Caucasian nowadays.
I've asked her if she's mixed, but she doesn't know, I think it would help if I asked her dad (my great grandfather), but he's passed away for a long time now.
I'm mixed (half French, half Chinese) and I have light brown eyes.
I know you guys can't answer for me if she's mixed or not, but any ideas why she has blue eyes?
2007-10-12 05:46:12 · 9 answers · asked by Duchess of Cookieshire 6 in Science & Mathematics ➔ Biology
Pigmentation is a complex thing. It is what we call a polygenic trait, meaning it takes more than one gene (pairs of genes, actually) to determine. Let me give you an example of a monogenic trait: ABO blood type. If your mom is Type A with genes AO and your dad is type O which means only OO genes, then you could be A or O depending on what gene you get from your mom. It is one gene from each.
Polygenic is not so easily determined. There are multiple genes to get from each parent, some can be expressed, some may not be, and then there is even interaction between the genes so that they are expressed a little differently than "normal."
What this all adds up to is, two brown eyed people can have a blue eyed child. You forget that we all pretty much start with blue eyes (this is the default color, so to speak, without the pigmentation). It is possible that your grandmother had the genes for brown, but lacked a gene for the iris to produce the pigment which meant that her eyes stayed blue.
2007-10-12 06:08:14 · answer #1 · answered by jade_calliope 3 · 3⤊ 0⤋
There are multiple genes involved in eye color - a brown/blue gene and a green/blue gene, for instance.
For simplicity, let's just deal with the brown/blue gene. Because brown is dominant, you can't tell if someone has a recessive blue gene. It's possible for someone with two brown-eyed parents to have blue eyes, if each was a carrier for the blue gene.
Further, mutations are possible.
Additionally, since eye color is determined by pigmentation, anything that affects the pigmentation (disease while very young maybe?), can affect eye color.
2007-10-12 05:56:28 · answer #2 · answered by Steve A 7 · 1⤊ 1⤋
There are rare, but natural occurrences of blue eyes in non-European populations. Since there's very little or no selection against the blue eye allele, it is maintained in populations, and will pop up every so often (Hardy-Weinberg). The dominance/recessive pattern isn't as simple as many people believe; there are at least three genes that determine its inheritance.
Redheads are a similar example; despite being recessive, there are many non-European populations that occasionally see a redhead (even Japan).
2007-10-12 06:08:39 · answer #3 · answered by yutgoyun 6 · 2⤊ 0⤋
Brown is a dominant gene. But if a parent has blue eyes (or a blue eye gene), their child has a 25% chance of having blue eyes.
2007-10-12 05:55:09 · answer #4 · answered by tmerion 4 · 1⤊ 1⤋
Blue eyes are a recessive genetic trait, which means that somebody can carry the DNA for blue eyes without having blue eyes themselves. If two people who carry these same recessive genes have children, there is a chance that their children will exhibit the recessive trait. I think it is likely that both of your grandmother's parents had some Caucasian or Ainu ancestry.
2007-10-12 05:55:39 · answer #5 · answered by Kristian D 3 · 2⤊ 2⤋
No I cant say that I do know any filipino that has a different eye color besides brown or a dark brown...... Every filipino that I have met even the half and half have brown eyes...... The father might have blue or green eyes but the brown in the filipino genes always come out in the kids...... Hope this helps you.....
2016-05-22 02:16:44 · answer #6 · answered by ? 3 · 0⤊ 0⤋
sometimes people are just born with a different eye colour, u dont hvae to inherit the gene's all the time, out of my 6 brothers and sisters i was the only one born with blonde hair
2007-10-12 05:58:23 · answer #7 · answered by Anonymous · 0⤊ 1⤋
her parents may have carried recessive blue eye genes. Who knows things happen. My mom and dad have brown eyes, they had four kids, me and my sister have brown eyes, another sister has green eyes and our brother has blue eyes. I got married to a blue eyed guy, I thought our kids would have brown or green eyes, them both have blue eyes and blond hair!!! I have brown hair. My green eyed sister got married to a brown eyed guy, her daughter has brown eyes but her son has blue...
2007-10-12 05:57:05 · answer #8 · answered by delina_m 6 · 0⤊ 1⤋
Sounds if maybe ur great grandma had some skeletons in her closet. Just kidding sweetie. Sometimes we are born with issues that cant be genetically explained...its just evidence that God can do the unexplainable!
2007-10-12 05:57:12 · answer #9 · answered by Capricorn 5 · 0⤊ 2⤋