Black people with blue eyes? | Yahoo Answers
Apparently all people with blue eyes have a single common ancestor. But for some reason this mutation just ended up altering our eyes rather than the . 'The Bachelor' Vs. 'Love Island:' Which Reality Dating Competition Is. The way blue eyes develop is even rarer than the eye color itself, however. Scientists have discovered that a genetic mutation on the OCA2. New research shows that people with blue eyes have a single, common ancestor . Scientists have tracked down a genetic mutation which took place years ago and is Date: January 31, ; Source: University of Copenhagen.
Caucasian relatives in your past A rare disease that makes a person an albino only in their eyes A new mutation Waardenburg syndrome A common way to end up with two different colored eyes. Albinism causes a person to be an albino.
One Common Ancestor Behind Blue Eyes
Albinism comes about when your body fails to make melanin, the pigment that gives skin, hair, and eyes color. In some forms of albinism, only the eyes are affected. Also, they probably would have tested you for this and told you about it at the Georgia Eye Institute. The final reason is that you are a woman.
This Is Exactly How Many People Have Blue Eyes
Like colorblindness or hemophilia, OA happens mostly in men see the OA link below for more details on why this is. If not OA, then what about the other possibilities?
- Why does everyone like blue eyes?
- This Is Why You Have Blue Eyes
- People with blue eyes all have one thing in common
You need to have Caucasian relatives on both sides as will hopefully become clear later. It can sometimes take many generations for a trait like blue eyes or straight hair to pop up in the family tree again. The reason it can take a few generations to see something like blue eyes or red hair is that these are both recessive genes.
Are blue eyes a genetic mutation? | Yahoo Answers
Remember that for most genes, you have two copies of each gene that you inherited from your mother and your father. The brown version of the eye color gene B is dominant over the recessive blue version b.
Genetically speaking, people with brown eyes can either be BB or Bb; people with blue eyes only bb. Baby blues Eiberg and his team examined DNA from mitochondria, the cells' energy-making structures, of blue-eyed individuals in countries including Jordan, Denmark and Turkey.
Black people with blue eyes?
This genetic material comes from females, so it can trace maternal lineages. They specifically looked at sequences of DNA on the OCA2 gene and the genetic mutation associated with turning down melanin production.
Over the course of several generations, segments of ancestral DNA get shuffled so that individuals have varying sequences.
Some of these segments, however, that haven't been reshuffled are called haplotypes. If a group of individuals shares long haplotypes, that means the sequence arose relatively recently in our human ancestors. The DNA sequence didn't have enough time to get mixed up. Melanin switch The mutation is what regulates the OCA2 switch for melanin production.
And depending on the amount of melanin in the irisa person can end up with eye color ranging from brown to green.
Brown-eyed individuals have considerable individual variation in the area of their DNA that controls melanin production. But they found that blue-eyed individuals only have a small degree of variation in the amount of melanin in their eyes.