Can a blue eyed man & a blue eyed woman spawn a brown eyed child?

Question

my biology teacher from eons ago said no, but my true blue eyed friends say yes! who is right?

Answer 1

I assume no, if their eyes are really blue. Eye colour is controlled by several genes, but the "dark" alleles are dominant in each case. So if both parents have light blue eyes, that means they are homozygous recessive for all eye colour genes. HOWEVER, as I have found at http://genetree.com/resource/eyeColorCalculator.php#eyeHistory
this only applies to LIGHT blue eyes. Look at that that site, it explains things in a pretty understandable form, and since this is the website of a genetic testing company - well, they might know it better than I do :).

Answer 2

No. The brown-eyed gene is dominant. If either parent had it, they would have brown eyes, not blue. So neither parent has a brown-eyed gene to pass on to their child. The other way around, however, is quite possible. If both parents carried the blue, and brown-eyed genes, they would have brown eyes (brown IS dominant, remember) but there's a decent chance that both parents will pass on their blue-eyed genes and have a blue-eyed child.

I suppose there's always a possibly for random mutation, but it's extremely, extremely unlikely.

Answer 3

Yes, they can.

Strait from wikipedia:

Eye color is an inherited trait influenced by more than one gene.[6][7] There seem to be three genotypic eye colors (brown, green, and blue) in humans.[3] Although it was once thought that brown eye color was always dominant and blue eye color was always recessive, the fact that two blue-eyed parents can give birth to a brown-eyed child has shown that the determination of eye color does not follow the simple rules of Mendelian inheritance.[6][8] Three gene pairs coding for human eye color are currently known: EYCL1, EYCL2, and EYCL3.[9][10]

Answer 4

The true answer is "Yes".
But only if at some point in the offspring's family tree a person possessed brown eyes. For example, lets say the great great great great grandfather had brown eyes, even if the mother and father have blue/completely different eyes, the child still has a small possibility of coming out with blue eyes.

Even if this is out of point, this goes the same for skin color. If a white male has kids with a black female and the generations after them are all black and mate with other black people, there is still a chance that one day a white child will be born from a black family.

It all has to do with genetics....Hope this helped.

Answer 5

No. In order to have a brown eyed child, they would have to have heterozygous genes for brown eyes. To be blue eyed you have to have to be homozygous for blue eyes, so it is physically impossible for two blue eyed people to spawn a brown eyed child. However, it is possible for a brown eyed man and a brown eyed woman to have a blue eyed child because you only need one brown gene to have blue eyes. This means that if they both also have a gene for blue eyes, they could have a blue eyed child.

Answer 6

No; since blue eyes requires two blue-eye-chromosomes, the child can't have anything other than two blue-eye-chromosomes neither.

Two brown eyed parents on the other hand can get a blue eyed child, even if the probability is as small as one to nine.

Answer 7

Having blue eyes is a recessive gene and brown eyes are a dominant gene. So to have blue eyes you would be a 'bb' combo which mean if two 'bb' blue eyed parents have a child, the only genes they child could receive would be a 'bb' combo which would then give them blue eyes

Brown eyed parents can have blue eyed children if they have both the dominant and recessive genes

Answer 8

no but two brown eye people can make a blue eyed baby.
If the brown eye gene was there the blue would be recaessive and not show. but a blue can be there and not show, but come up later.
That is why you see blue eved black people, especially in the deep south. Maybe the blue eyed daddy was several generations back

Answer 9

MY biology teacher from eons ago said two positive parents could not produce a child with a negative bloodtype. Both my sister and I have negative bloodtypes thank you very much, so I found an article which proved him wrong and he ended up apologizing to me.

Dominant and recessive genes are at work here. Mom is usually a carrier of dominant genes even if she herself does not show them.

Answer 10

Yes they can if there genes have a recessive brown gene in them. Usually Blue is recessive and brown is dominate. Look at the couples parents. If one of them has brown eyes, then it can come out in the child's eyes.