The Naked Scientists

The Naked Scientists Forum

Author Topic: How can my son have blue eyes?  (Read 14460 times)

Offline ozric

  • First timers
  • *
  • Posts: 3
    • View Profile
How can my son have blue eyes?
« on: 13/08/2007 18:15:25 »
Dear Science gods,

I am writing you with a question that has had me puzzled for about 10 months. That is, since my son was born.
His eyes are clear-blue.

Both me and my wife has got brown eyes.
My father has brown, my mother has blue.
My wife's father has brown and so does her mother.

How is it possible? Hope I am not boring you with a question that might have been answered several times in this interesting forum.

Thanks


 

Offline Simulated

  • Neilep Level Member
  • ******
  • Posts: 7188
  • Thanked: 1 times
  • Simulated..What more do you needa know :P
    • View Profile
    • Facebook
How can my son have blue eyes?
« Reply #1 on: 13/08/2007 18:18:50 »
My eyes were blue at once. When I was born. After a year they changed to greenish brownn.  Whythat is IDK, but maybe someone will know. Sorry I coudln't help you.
 

Offline DoctorBeaver

  • Naked Science Forum GOD!
  • *******
  • Posts: 12656
  • Thanked: 3 times
  • A stitch in time would have confused Einstein.
    • View Profile
How can my son have blue eyes?
« Reply #2 on: 13/08/2007 18:18:55 »
It is a bit unusual for 2 parents with brown eyes to have a blue-eyed child. The reason is that brown is a dominant colour whereas blue is recessive. The child will also normally have brown eyes if 1 parent has brown and the other blue.

However, it is not a hard and fast rule. The fact that 1 of the child's grandparents has blue eyes is probably the key. The gene responsible probably stuck its hand up and said "My turn!".
 

Offline neilep

  • Withdrawnmist
  • Naked Science Forum GOD!
  • *******
  • Posts: 20602
  • Thanked: 8 times
    • View Profile
How can my son have blue eyes?
« Reply #3 on: 13/08/2007 18:31:44 »
I did find this (blatantly copied and posted from wiki)

Eye color change

Often, newborns have blue eyes, which change to green, hazel, light brown or dark brown, as they grow older. It is thought that exposure to light after birth triggers the production of melanin in the iris of the eye. By three years of age, the eyes produce and store enough melanin to indicate their natural shade. While changes in eye color of infants are more common, even in adults, eye color changes are seen, most often as a result of exposure to the sun. Sunlight triggers melanin production in the eye, as it does to the skin. People with green eyes in the winter might develop darker, more hazel eyes if they spend more time outdoors. Many people's eyes appear to change color when they change their clothing, or when they change moods, this is disputed due to the apparent need to instantaneously produce melanin; however no conclusive research exists.

LINKS: http://www.thetech.org/genetics/ask.php?id=29
http://en.wikipedia.org/wiki/Eye_colour
http://www.kumc.edu/gec/support/eyecolor.html
 

Offline Karen W.

  • Moderator
  • Naked Science Forum GOD!
  • *****
  • Posts: 31653
  • Thanked: 5 times
  • "come fly with me"
    • View Profile
How can my son have blue eyes?
« Reply #4 on: 13/08/2007 18:43:05 »
Good Information.. My moms side of the family were almost all brown eyed my husbands mothers side are all brown and black eyed. Native American and irish in them, as in my moms side of the family.
My fathers side was swedish decent.. I have one sister with blue eyes 5 sibs brown eyed and one brother withhazel to green on occasion.

My kids all have blue eyes as does my huband and all of his brothers.. must be his dads side finnish decent! LOL There must be some blue eyes in there somewhere. and my dad was blond, and blue eyed.
 

Offline ozric

  • First timers
  • *
  • Posts: 3
    • View Profile
How can my son have blue eyes?
« Reply #5 on: 13/08/2007 18:45:44 »
Wow, thanks for great and fast ( :o) replies!

I have also read that it is very common for eye color to change, but in most cases the change occurs around 4 to 6 months. Seb is now 10 months. Anyway thanks for the answers!
 

Offline Karen W.

  • Moderator
  • Naked Science Forum GOD!
  • *****
  • Posts: 31653
  • Thanked: 5 times
  • "come fly with me"
    • View Profile
How can my son have blue eyes?
« Reply #6 on: 13/08/2007 18:47:59 »
Enjoy the forum and welcome Ozric!
 

Offline Simulated

  • Neilep Level Member
  • ******
  • Posts: 7188
  • Thanked: 1 times
  • Simulated..What more do you needa know :P
    • View Profile
    • Facebook
How can my son have blue eyes?
« Reply #7 on: 13/08/2007 18:49:56 »
Thanks Neil! And Yes most replies are fast!
 

Offline DoctorBeaver

  • Naked Science Forum GOD!
  • *******
  • Posts: 12656
  • Thanked: 3 times
  • A stitch in time would have confused Einstein.
    • View Profile
How can my son have blue eyes?
« Reply #8 on: 13/08/2007 18:55:02 »
ozric (is your name a reference to tentacles, by any chance?), as karen said, welcome to The Naked Scientists Forum.

Here are a couple of links that are relevant to your question.

http://www.dna-bioscience.co.uk/did_you_know_eye.shtml
http://www.bbc.co.uk/schools/gcsebitesize/biology/variationandinheritance/0dnaandgenesrev5.shtml
 

Offline ozric

  • First timers
  • *
  • Posts: 3
    • View Profile
How can my son have blue eyes?
« Reply #9 on: 13/08/2007 18:58:26 »
Thanks for the welcome :)


@ DoctorBeaver: indeed a reference to the tentacles, yes :)

I forgot to mention that I am Swedish, my wife South African. We both have dark hair but little Seb has very very blond hair!
 

Offline neilep

  • Withdrawnmist
  • Naked Science Forum GOD!
  • *******
  • Posts: 20602
  • Thanked: 8 times
    • View Profile
How can my son have blue eyes?
« Reply #10 on: 13/08/2007 19:04:49 »
Hey !!..I'm getting in on this 'welcome' thing too...so ..



OZRIC.....(just need to chill out to some psychedelic choons now)
 

Offline DoctorBeaver

  • Naked Science Forum GOD!
  • *******
  • Posts: 12656
  • Thanked: 3 times
  • A stitch in time would have confused Einstein.
    • View Profile
How can my son have blue eyes?
« Reply #11 on: 13/08/2007 19:09:41 »
My effulgent is pungent 
 

Offline neilep

  • Withdrawnmist
  • Naked Science Forum GOD!
  • *******
  • Posts: 20602
  • Thanked: 8 times
    • View Profile
How can my son have blue eyes?
« Reply #12 on: 13/08/2007 20:06:49 »
your lambent sheen is indeed polished to a tee !
 

Offline Karen W.

  • Moderator
  • Naked Science Forum GOD!
  • *****
  • Posts: 31653
  • Thanked: 5 times
  • "come fly with me"
    • View Profile
How can my son have blue eyes?
« Reply #13 on: 14/08/2007 07:36:26 »
LOL LOL! My father was Swedish and blond blue eyed. I did not get a single brown eyed child.
 

Offline rosy

  • Neilep Level Member
  • ******
  • Posts: 1018
  • Chemistry
    • View Profile
How can my son have blue eyes?
« Reply #14 on: 14/08/2007 10:12:04 »
Blue eyes is a recessive characteristic, it indicates that the iris isn't making any other pigments that "hide" the blue colour (hence why all babies have blue eyes, they haven't started making pigments yet).
If you have brown eyes you may have two "brown eyed" genes (I'll call them BB) or one brown and one not-brown (Bb, the small b denoting a gene which doesn't make the pigment).
If the parents of a child both have brown eyes they may be BB and BB in which case all children will also be BB and have brown eyes, but the parents may be BB and Bb in which case the children will be BB or Bb (and will still have brown eyes, they all still have at least one B.
If both brown eyed parents are Bb, however, the children (still taking one gene from each parent, may be BB, Bb, Bb, or (and this is the blue eyed tot) bb.
In this way, although generations may be brown eyed (although it's statistically unlikely), a blue eyed child can result. Brown eyed children of two blue eyed parents are much more unlikely...

It's more complicated than that as actually more than one gene is involved, but for each gene it's the same sort of picture.
 

The Naked Scientists Forum

How can my son have blue eyes?
« Reply #14 on: 14/08/2007 10:12:04 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums
 
Login
Login with username, password and session length