Can two adults with blue eyes have a brown-eyed baby?

Question

Or is this just impossible. Other members of the parents family have brown eyes too.

Answer 1

Here are a couple of websites that are fun to play around with.

http://museum.thetech.org/ugenetics/eyeC...

http://babymed.com/Tools/Other/Eye_Color...

http://www.docshop.com/2008/01/04/what-c...

The third one is my favorite because it shows you a straight forward chart. The first one, however, is the most fun.

According to these websites, two blue eyes should not produce a brown eyed baby.

Answer 2

yes....there may have been a blue-eyed relative long ago....i believe that blue eye gene is stronger than the brown eyed gene...

Answer 3

i'm Italian and sorry if i make mistakes writing....however i know that it is possible if your parents have brown eyes...because you in your DNA have the DNA of your parents....

and so...this is Christmas..ahahahah...

Toto

Answer 4

I hate to break this to you, but Mendelian genetics is almost a farce.  

Non-Mendelian genetics is covers pretty much 96% of known genetics.

However, we teach Mendelian genetics because it is a good stepping stone into the world of Genetics.

Theoretically, brown eyes is considered dominant in some terms, but it is dependant on gene repression at the time of embyro development.  I hope you can explain that to your teacher.

Answer 5

No, absolutely not.  Blue eyed parent can not have a brown eyed baby.  Blues eyes are a recessive genetic trait.  Since both parents have blue eyes both parents must carry two recessive alleles making it impossible for parent to pass on a dominant brown eye gene to their offspring.  Having a brown eyed relative other than the parents is irrelevant if both parents have blue eyes since there is only a double recessive genotype can produce this phenotype.

B = brown eyes

b = blue eyes

Since both parents have blue eyes, their genotypes are both "bb".

So a cross of these parents would look like this:

bb x bb = 100% bb

So all offspring is "bb" and blue eyed as well.

That said, eye color is not determined by a single gene.  Evidence suggests that the brown eye gene is carried on chromosome 15, while a green eye gene is carried on chromosome 19.  Both the brown eyed allele and the green eyed allele are dominant to blue eyes.  Further, brown eyes are dominant to green eyes.  There is also evidence to suggest that a gene controls brown pigment in the central area of the iris.  Regardless, to have true blue eyes you must be double recessive for both the brown and green eye genes.

Answer 6

yes... if both parents are carrying a recessive blue gene then possibly they could have a blue-eyed child...

Answer 7

It's possible, but it's pretty rare.  Eye color is not 100% dependent on the genes of the parent -- every once in a while you get a gene from a distant relative that causes a switch.

Answer 8

both of my parents have brown eyes and i have blue.

it all has to do with alleles and genes. if the baby's grandparents have brown eyes, its possible for the baby to have brown eyes

Answer 9

I agree with The Tourist. Brown is BB or Bb. However, weird stuff is known to happen with eye color, and  eye color can be different  if there's a mutation.

For example, my husband has hazel eyes, (recessive -bb) I have brown, (dominant, Bb) . My dad has brown (BB).         My mother has green eyes (bb). Our two daughters have brown eyes (Bb), One son has hazel eyes (bb), and our other son has one green eye and one 3/4 green 1/4 brown.(bb) He has sectoral heterochromia.

Answer 10

yes because other people said so

Answer 11

No, the blue eyed gene is recessive (b) whereas the brown eyed gene is dominant (B).

Therefore, for a person to have blue eyes they must have the gene bb. Whereas a brown eyed person can have either BB or Bb (they have brown eyes because the brown eyed gene is dominant).

So if both parents have blue eyes, there is zero chance the baby will be brown eyed.

Answer 12

Yes, blue eyes are the result of a recessive gene. Odds are that the child WILL have brown eyes!

Answer 13

of course

Answer 14

I think colored eyes are a double recessive so maybe not... but i took biology like two years ago so i don't really remember.

Answer 15

yea there is a 25% chance of this happening

Answer 16

If brown eyes exist on either sides of your families then yes it's very possible. Depends on how close you are genetically to the Brown eye gene. For example if both your parents have brown eyes and you have blue eyes because maybe your grandfather had blue eyes, then all your other grandparents and in-laws have brown eyes -- your kids probably going to have brown eyes. Now if you have blue eyes because both your parents have blue eyes along with your partner and his parents -- bet money your kids going to have blue eyes.

Answer 17

yea of course they can. each person has 2 alleles( different forms of the same gene) that code for a specific feature. some are dominant meaning that they will show up in the phenotype and some are recessive, meaning that they will not show in the phenotype if they r paired up with a dominant allele of an other color. for example lets say the blue color is dominant for both parent and this is represented with capital B and the brown color is recessive which is represented by the small b. so the  mother has the alleles: Bb and the dad was the alleles : Bb as well. because blue eyes are dominant, this means that both parents have blue eyes. however, during fertilisation, the 2 small b alleles can pair up and give birth to an offspring with brown eyes. you can figure this out using the pannet's square( u can have some research on this ) hope this wasnt confusing :P