Can a Browneyed Parent and a Blueeyed Parent Have Blueeyed Babies

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How can dark-brown-eyed parents take blue-eyed children?

• Thread starter Pithikos
• Starting time date Mar half dozen, 2013

I am learning about genes and heritage currently and I am a chip baffled nigh something.

In my volume information technology states that in a plant's gene, if S is for polish leaves and south for rough leaves, and then nosotros get these combinations:

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

So the merely manner to get a plant with smooth leaves is if both parents have the recessive factor s.

But what happens when it comes to heart color? If we say that for dark-brown eyes we take B and for blue eyes we have b then how can we get bluish eyed children from brown eyed parents? For instance:

                          Parent      |    Child     |  Ascendant alleles B + b      ->     Bb      ->     B b + B      ->     bB      ->     B B + B      ->     BB      ->     B b + b      ->     bb      ->     b                        

So the but way for a kid to go blue eyes is the two parents have blueish eyes, according to my tabular array. In whatever other case the kid has brown eyes.

This ofcourse is incorrect as I know families where the parents take brown eyes and some of their children have blue eyes. And then where did I do wrong?

Answers and Replies

Each parent has 2 alleles, with the brown eyed B dominant, not but one every bit in your table. And so the style brown-eyed parents take a blue-eyed child is as follows:

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

The bb combination will accept blue eyes. Can blue-eyed parents have a brown-eyed kid?

Note that heart colour isn't only determined past one gene. In uncomplicated models it can be represented past ii genes: one governing dark-brown/blue and one dark-green/blue with authorization being a hierarchy of dark-brown > green > blueish but in reality it'south more than complicated than that. At that place are a broad variety of genes involved in the formation of the center that dictate middle colour.

Fascinating, I never realised that blue optics were a outcome of Rayleigh handful of reflected lite.

Fascinating indeed! I also often think of that couple by the Black 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 one.two billion straight descendants? Depending were in the globe you lot are they seem to be getting rarer. But here in Ireland were there has been piffling clearing for over 2000 years bluish eyes make up 96% of the population!

I also frequently call up of that couple by the Blackness Sea 6000 years ago when they get-go looked in to their newborn baby boys blue optics and what they would take thought

What is surprising in the newborn having bluish optics? They all practise, eye color changes much later.

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

All of them!!! Most Jewish people of Kazakh/Ashkenazi decent such as myself are built-in with dark chocolate-brown or even black optics. Not to mention virtually African races southward of the Sahara. Newborn chocolate-brown eyes also occur among native Americans/Asians/Hispanics. And yes fifty-fiftywhite Europeans occasionally!!

That'southward adept to know, I didn't know that could happen

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

It is because is a Mendelian trait; if both parents accept the b gene, even if they are brown eyed they may have blue-eyed children, equally it is recessive. Every bit far as I call back, the percentages are: 25% brown eyed children, fifty% Bb, and 25% bb, that is, bluish eyed children.

Each parent has two alleles, with the brown eyed B ascendant, not simply i as in your tabular array. Then the way brown-eyed parents take a blue-eyed kid is as follows:

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

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

Ok, merely if each parent has two alleles, and so nosotros accept a full of four. How are only two alleles chosen from those 4 for the kid? Is it a random selection?

Ok, but if each parent has ii alleles, then we accept a full of 4. How are only two alleles chosen from those 4 for the child? Is it a random choice?

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

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

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

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

my wife thinks she might be adopted simply her parents aren't talking to her correct now and have motive to possibly lie. Hither is our state of affairs.
Me/Dad: Brown optics. Mom has chocolate-brown eyes, dad, his female parent and her mother have blue.
Her/Mom(my wife): Chocolate-brown eyes. Six siblings have brownish eyes. Mom and Dad and their respective moms and dad ALL have dark-brown eyes. Here cousins ALL have brown eyes.
We have ii kids, a boy and daughter. Both with blue eyes. Is this possible if she's really genetically from people with brown eyed parents and grandparents?

Ii brown eyed people tin can take babies with blue eyes.

The short answer is that dark-brown-eyed parents can take kids with brown, blue or virtually any other color optics. Eye color is very complicated and involves many genes.

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

My ex fiancee is Sicilian, his parents had dark dark-brown hair and eyes, he has sky blue eyes and had blond hair until his teens when it turned browner. He believes he may accept Norman beginnings. Sounds reasonable, he's also very stake.

Final edited: Apr xv, 2015

So the gene leading to blue optics can be 'recessive' for several generations, not just i or two?

The factor(and it isn't just one cistron, and it isn't simply genes) doesn't know or care most how many generation, or the color of the parents. If it is there, it is in that location.

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