can two blue eyed parents have a brown eyed child?

Answer 1

Almost always NO...blue is recessive and brown is dominent. If you have a gene for both, you will have borwn eyes. 2 blue eyed parents will have a blue eyed child. Once in a blue moon, genetics takes a break (see below...but the chances are so slim, a paternity test is in order).

HOWEVER 2 brown eyed parents can have a blue eyed child.


Eye color is an inherited trait influenced by more than one gene.[6][7] In humans, three genes coding for eye color are currently known: EYCL1, EYCL2, and EYCL3.[8][9] These genes account for three phenotypic 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, although this is so rare that scientists didn't even notice that it happens (perhaps 1 in 100,000,000) until recently. It is not like two brown haired parents who have a blonde haired child, because blonde and brown hair is the same gene pair. Eye color is the most demanding of any gene, due to the fact all four have to be a the same color or the eye color will not be pure, and will be mixed with each other (like blue-green).[6][10] Eye color usually stabilizes when an infant is around 6 months old. [11]

Answer 2

no, for someone to have blue eye they have to carry two recessive blue genes otherwise the dominant brown gene would make the eyes brown. This means that they would only carry the genes to make blue eyes.

Two brown eyed parents can have a blue eyed child because they can carry a dominant brown gene and a recessive blue. They could both pass on a recessive blue gene giving the child blue eyes.

The only way i can see blue eyed parents having a brown eyed child is if one of them has the same problem that i do. My eyes are different colours, both have blue, green and brown in them. Its caused through damage to the gene which passes on colour causing the eyes not to get enough brown pigment. If one of the parents had this problem (meaning the eyes should have been brown but look blue) Then they would carry a brown gene which they could pass onto their child. I'm not sure how common the problem is though.

Answer 3

NO -very unlikely - but there are RARE exceptions to every rule - , like when 2 black parents have a WHITE chilId I strongly suggest a paternity test, go to http://www.dna-bioscience.co.uk/ to see charts etc - you deserve to know the truth -and so does the child when the time is right.
The eye colour inheritance chart is used to determine either:

The possible eye colours of the child when the eye colours of the mother and the father are known, or
The possible eye colours of the father when the eye colours of the mother and child are known
Eye colour is known to have a polygenic inheritance pattern, possibly governed by 6 or more genes. There are also 6 different described eye colours. Basically, dark is dominant at each of the 6 genes, and the more dominant alleles that you have the darker your eyes are. The different eye colours and the number of dominant alleles suggested in this theory are shown below.

DNA Bioscience Eye Colour Inheritance Chart:

Light blue 0 dominant alleles
Blue 1 dominant allele
Blue-green 2 dominant alleles
Hazel 3 dominant alleles
Light brown 4 dominant alleles
Brown 5 dominant alleles
Dark brown / black 6 dominant alleles


Basically, based on this theory:

2 light blue eyed parents cannot have a blue eyed (or darker eyed) child.
2 blue eyed parents can have a blue-green (or lighter) eyed child, but not hazel or anything darker.
2 blue-green eyed parents can have a light brown (or lighter) eyed child, but not brown or anything darker.
1 light brown eyed parent and 1 'blue-green' eyed parent can have a child with any of the possible eye colours.
2 dark brown or black eyed parents can have a child with any of the possible eye colours (but it is unlikely they will have a light eyed child, such as light blue or blue).
Lastly eye colour usually starts out much lighter at birth and becomes its true colour in 1 or 2 years after birth. Variations can also occur randomly.

Interestingly, this theory was generated in the late 1800s, which demonstrates

how inheritance patterns were pretty well understood (by some) back then, and,
that eye colour is, still today (even with the human genome sequenced), very difficult to predict due to its polygenic inheritance pattern.
In conclusion, eye colour is not a very reliable or accurate method of determining the paternity of a child.



The possible ABO blood types of the child when the blood types of the mother and father are known (top chart)
The possible ABO blood types of the father if the blood types of the mother and the child are known (bottom chart).


ABO blood types can be difficult to understand. This is mostly due to the fact that the O-type antigen is masked by the presence of an A- or B-type antigen. This is explained in the following chart, which shows the different genotypes that make up the blood types.

Genotype (DNA) Blood Type
AO or AA A blood type
AB AB blood type
BO or BB B blood type
OO O blood type

For example, two O blood type parents can only produce a child with O blood type. Two parents with A blood type can produce a child with either A or O blood type. Two parents with B blood type can produce a child with either B or O blood type. One parent with A and another with B can produce a child with A, B, AB or O blood types. If one parent has A and another has AB, they can produce a child with A, B, or AB blood type. If one parent has A and another has O, they can produce a child with A or O blood type.

Rh Positive (Rh+) and Negative (Rh-) Blood Types

The Rh (+/-) factor is inherited separately from the ABO blood types. Similarly to the masking effect of the O gene in ABO blood types, the Rh negative (Rh-) gene is also masked by the presence of an Rh positive (Rh+) genotype. Therefore, a person can have an Rh+ blood type and still have an Rh- gene (See the chart below) Furthermore, two parents with Rh + blood type can have a child with Rh- blood type.

Genotype (DNA) Blood Type
(+ , -) or (+ , +) Rh +
(- , -) Rh -

Answer 4

Absolutely and categorically not. The gene for blue eyes is recessive so that in order for a person to have blue eyes both of their genes for eye colour must be the blue one. Therefore 2 blue eyed parents must pass on a blue eyed gene therefore their child will have 2 blue eyed genes and will therefore have blue eyes.

As the brown eye colour gene is dominant a person with brown eyes could have both a brown eye gene and a blue eye gene so if both parents passed the blue eye gene to their child the child has a 1:4 chance of having blue eyes.

Answer 5

No. It is not possible for 2 blue eyed parents to have a brown eyed child.


However it is possible for two brown eyed parents to have a blue eyed child.


Everyone has 2 genes which determine eye colour and brown is dominant.

So if you have 2 blue genes you will have blue eyes.
If you have 2 brown genes you will have brown eyes.
If you have one of each, the brown dominates, and you have brown eyes.

Each parent passes on 1 of their two genes to the child.

A blue eyed person has two blue genes. So a blue eyed mother must pass a blue gene to the baby. Similarly a blue eyed father can only pass on a blue gene, so the baby gets two blue genes and must have blue eyes. (there is no way it can have brown eyes).

However a brown eyed person may have either:-
2 brown genes or
1 brown gene and one blue.

If both parents have 1 brown gene and 1 blue gene, and both pass on their blue gene to the baby, then the baby will have 2 blue genes and therefore blue eyes.

Any other combination will result in brown eyes.


.

Answer 6

I have heard blue eyes do not carry the brown eyed gene. My Mother and father had beautiful blue eyes. They had eight children with turquoise blue eyes. I was the 8th, and I have a brown. I have always wondered, and have done a lot of research on this subject. Mostly I have read, it is impossible, but have read where it is rare, but can happen.

Answer 7

In theory, no, though the other way round (two brown-eyed parents having a blue-eyed child) is possible. But the laws of genetics are not quite as straightforward as many believe: allowing for blue and brown only ignores the many other shades of eye colour or mix including greys and hazels which might loosely be described as blue or brown and there is always the chance of a mutation occuring anyway. So in practice it is possible. Just very unlikely.

Answer 8

No. Two brown eyed parents can have a blue eyed child.

Answer 9

I was going to say no, because brown is dominant, then I found this on the Web:

Odd as it sounds, it’s much more common for brown-eyed parents to have blue-eyed children than for blue-eyed parents to have brown-eyed children.
That’s because brown eyes are dominant, and the eye color likely will have already shown up in a parent if the trait is in the gene pool. So absent the dominant brown-eyed gene, blue-eyed parents are likely to just keep on producing blue-eyed children.
However, blue-eyed parents can have brown-eyed children, although genetic processes for that possibility aren’t at this time well understood.

Answer 10

LOL I think I was involved in this question you made earlier today.

The answer is NO. They cannot. Blue is recessive....brown is dominant. If a parent has blue eyes, they have gotten a blue from each parent and CANNOT be a carrier of brown...if they were carriers, they would have brown eyes themselves because it DOMINATES over blue.

You can have a parent that has brown eyes and another that has blue (remember......you need a gene from EACH parent) and have blue eyes.....BECAUSE....a parent's parent can have blue and another brown....and therefore, one trait will be blue that was given....and....the parent with the brown eyes is then a carrier of blue, as well.

SO....with a parent with Brown and Blue can have a blue eyed child IF the brown eyed parent gives the BLUE trait they carry over the brown.

Traits/genes come directly from parents and NOT ancestors (indirectly). They just don't appear randomly from the past.

My Grandmother has brown eyes. My grandfather blue.

My mother has brown eyes, but HAS to be a carrier of blue because that is all my grandfather could give her.

My uncle (her brother has blue) which means my grandmother has to be a carrier of blue since it takes TWO GENES to make the trait if recessive and if she woud've given brown, then he would've had brown eyes, as well.

My father has brown eyes. I have brown eyes. It is entirely possible my mother passed on a blue gene to me and my father gave me the brown so I could be a carrier of blue. OR...I could've gotten BOTH browns from my parents and no blue. I have no idea if I am a carrier of blue yet.