Can Two Blue Eyed Make a Brown Eyed Baby

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How tin brown-eyed parents accept blue-eyed children?

• Thread starter Pithikos
• Start appointment Mar vi, 2013

I am learning about genes and heritage currently and I am a bit baffled almost something.

In my book it states that in a establish's factor, if South is for smooth leaves and south for rough leaves, then we get these combinations:

                          Parent institute | Kid constitute | Dominant alleles S + s       ->     Ss     ->     Due south s + S       ->     sS     ->     Due south Due south + S       ->     SS     ->     Due south s + s       ->     ss     ->     southward                        

And then the merely fashion to get a establish with shine leaves is if both parents have the recessive gene s.

But what happens when it comes to centre color? If we say that for brown eyes we have B and for bluish eyes we have b and then how tin we become blue eyed children from brown eyed parents? For case:

                          Parent      |    Kid     |  Dominant alleles B + b      ->     Bb      ->     B b + B      ->     bB      ->     B B + B      ->     BB      ->     B b + b      ->     bb      ->     b                        

And then the just way for a kid to get bluish eyes is the two parents have blue optics, according to my table. In any other case the kid has chocolate-brown optics.

This ofcourse is wrong equally I know families where the parents have brown eyes and some of their children have blue eyes. Then where did I practise wrong?

Answers and Replies

Each parent has two alleles, with the brown eyed B dominant, not merely i as in your table. Then the fashion brownish-eyed parents have a blue-eyed child is every bit follows:

Mother - Bb Father Bb Possible Children BB, Bb, bB, bb

The bb combination will take blue eyes. Can bluish-eyed parents have a brown-eyed child?

Note that eye colour isn't only adamant by one factor. In simple models it tin exist represented by 2 genes: one governing brown/blueish and 1 green/blueish with authority being a hierarchy of brown > green > blueish but in reality information technology's more complicated than that. There are a wide multifariousness of genes involved in the formation of the eye that dictate centre colour.

Fascinating, I never realised that blue eyes were a issue of Rayleigh scattering of reflected light.

Fascinating indeed! I also oftentimes think of that couple by the Blackness Body of water 6000 years ago when they first looked in to their newborn baby boys blue eyes and what they would have thought of his and their 1.two billion direct descendants? Depending were in the world yous are they seem to be getting rarer. Simply here in Ireland were there has been little clearing for over 2000 years blue eyes make up 96% of the population!

I likewise oftentimes think of that couple by the Black Sea 6000 years ago when they first looked in to their newborn baby boys blue optics and what they would have thought

What is surprising in the newborn having blue eyes? They all practise, middle color changes much later.

What is surprising in the newborn having blueish eyes? They all do, eye color changes much subsequently.

All of them!!! Most Jewish people of Kazakh/Ashkenazi decent such as myself are born with dark brownish or even black eyes. Non to mention most African races south of the Sahara. Newborn dark-brown eyes too occur among native Americans/Asians/Hispanics. And yes fifty-fiftywhite Europeans occasionally!!

That's good to know, I didn't know that could happen

It is good to know Monique, there are so many superstitions and sometime wives tales when it comes to eye colour!

Information technology is because is a Mendelian trait; if both parents accept the b gene, even if they are brownish eyed they may have blue-eyed children, equally it is recessive. As far equally I remember, the percentages are: 25% chocolate-brown eyed children, 50% Bb, and 25% bb, that is, blue eyed children.

Each parent has two alleles, with the brown eyed B dominant, not just i as in your table. So the way brown-eyed parents take a bluish-eyed child is as follows:

Mother - Bb Male parent Bb Possible Children BB, Bb, bB, bb

The bb combination will have blue optics. Tin blue-eyed parents have a brown-eyed child?

Ok, only if each parent has 2 alleles, so we have a total of four. How are but two alleles called from those iv for the child? Is information technology a random choice?

Ok, but if each parent has 2 alleles, then we have a total of 4. How are just 2 alleles chosen from those 4 for the child? Is it a random pick?

One allele is on each chromosome and each parent gives their child one chromosome. It's a bit more than complicated than that but is this what y'all're asking?

Ok. I accept a question though it appears information technology'due south a couple years later your discussion. lol.

my wife thinks she might exist adopted merely her parents aren't talking to her correct at present and accept motive to possibly lie. Here is our situation.
Me/Dad: Chocolate-brown eyes. Mom has brown eyes, dad, his female parent and her mother have blue.
Her/Mom(my married woman): Dark-brown eyes. Half-dozen siblings have dark-brown eyes. Mom and Dad and their corresponding moms and dad ALL have chocolate-brown eyes. Hither cousins ALL take dark-brown optics.
We have 2 kids, a boy and girl. Both with blueish eyes. Is this possible if she's really genetically from people with chocolate-brown eyed parents and grandparents?

Ok. I have a question though it appears it's a couple years after your discussion. lol.

my wife thinks she might be adopted only her parents aren't talking to her right now and have motive to mayhap lie. Here is our state of affairs.
Me/Dad: Brown eyes. Mom has brown eyes, dad, his mother and her mother have blue.
Her/Mom(my married woman): Brown eyes. Six siblings have chocolate-brown eyes. Mom and Dad and their corresponding moms and dad ALL have dark-brown eyes. Here cousins ALL have chocolate-brown eyes.
Nosotros have ii kids, a boy and girl. Both with blue eyes. Is this possible if she's really genetically from people with chocolate-brown eyed parents and grandparents?

Two dark-brown eyed people can have babies with blue eyes.

The short reply is that brown-eyed parents can have kids with brown, blueish or nigh whatsoever other color eyes. Eye colour is very complicated and involves many genes.

http://genetics.thetech.org/ask/ask2

My ex fiancee is Sicilian, his parents had night brown hair and eyes, he has sky blue eyes and had blond pilus until his teens when information technology turned browner. He believes he may have Norman ancestry. Sounds reasonable, he's also very stake.

Final edited: April fifteen, 2015

Then the cistron leading to blueish eyes tin can be 'recessive' for several generations, not only one or ii?

The cistron(and information technology isn't just one gene, and information technology isn't just genes) doesn't know or care about how many generation, or the colour of the parents. If it is there, it is in that location.

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