Probablility of blue eyes

kpanic | 17:50 Mon 04th Dec 2006 | Body & Soul

15 Answers

What is the probability of a child having blue eyes at birth when the parents have " brown and blue " eyes?

The No. 7, is it lucky?

Which of these people......................

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Pippa68

All babies are born with blue eyes ~ just varying shades. My brother has brown eyes, and at birth his eyes were a very deep blue..more of a navy colour.

Mr Pippa has brown eyes & I have blue. Our daughters have blue eyes.

It also depends on your own parents eye colours as to the eventuality of your childs eye colour. Dominant genes are a funny thing.

Ethel

Not all babies are born with blue eyes.

Most babies born to Indian and Asian parents are born with brown eyes.

It is true that all white babies are born with blue eyes, and the permanent eye colour will develop by the age of 6 years.

Octavius

Most babies are born with blue eyes, the transformation has to do with the protein melanin. Melanin is a brownish pigment that adds colour to hair, eyes, and skin. At the time babies are born, melanin hasn't yet been "deposited" in the eyes' iris. Hence, they appear blue.

After about six months, eyes change colour depending on the amount of melanin. If there is a lot of it, the eyes will turn brown or black. If there is little, they'll stay blue. And if there is no melanin (albinism), then the eyes may appear pink.

Research shows that where one parent has blue eyes and the other has brown eyes, that the child has a 50% chance of having blue and 50% chance of brown. Where the parent with the blue eyes has a lesser blue colour, then the brown will be dominant. For example with brown and blue/green eyed parents, the odds are that the child has 50% probability of brown eyes and 25% probability of green eyes and 25% probability of blue eyes (or 50% blue/green). About half of the children with brown eyes will carry the Green allele for the gey gene (common gene for eye colour ), and the other half will carry the blue allele, so their children may have blue, green or brown eyes.

spudqueen

Yes, white babies will all have blue eyes at birth. Whether they stay that colour or not you'll have to wait and see. My friend and her husband both have brown eyes yet both their children (now teenagers) have blue eyes.

Pippa68

I stand corrected, Ethel ~ of course I was looking from the caucasian perspective!

I suppose if the baby is born from a mixed parentage (1 black with brown eyes, 1 white with blue eyes) the highest probability is brown eyes...but you never know.

Katie~77

I have brown eyes and my husband has blue. One of our children has blue eyes and the other has green eyes. My Mum has brown eyes and my Dad has blue. Four of us have brown eyes and one has blue. Make of that, what you will.x

auzzie

My husband has brown eyes and i have green, both our children have very blue eyes! (not sure what the milkman's is though)

ummmm

If you mean what colour eyes the child is likely to end up with...then I would say brown as it is the more dominant.

Nummy

Try here...

http://museum.thetech.org/ugenetics/eyeCalc/ey ecalculator.html

it works out the most likely outcome.

gen2

The classical view of this inheritance is as follows:

Blue (b) is recessive to brown (B).

The blue-eyes parent must have inherited a (b) gene from both parents and be (bb).

The brown eyed parent will be either (BB) or (Bb).

If the brown eyed parent is (BB) then (BB) crossed with (bb) will always give (Bb) offspring with brown eyes, i.e. 100% certainty.

If the brown eyed parent is (Bb) then there is a 50% chance of the offspring being (Bb = brown) and 50% chance of being (bb = blue)

So it really depends upon the chances of the brown-eyed parent being (BB) or (Bb) and that will depend on their parents and grandparents etc.

The overall chances of the child having brown eyes will therefore lie somewhere between 50% and 100%.

Unfortunately, the classical view is a little over-simplified as eye colour is not determined by a single gene by the abobe is a good indication of what is likely.

gen2

last line should read *** but the above is a good . . .***

gen2

� Cripes! Is this B & S? I thought I was in Science!

* * * makes a quick departure. * * *

Scarlett

http://museum.thetech.org/ugenetics/eyeCalc/ey ecalculator.html