what two human eye colors can't produce a brown-eyed baby?

Question

i have heard that there is no way two certain eye colors in humans that can make a brown eyed baby.green? and ?

Answer 1

Here is the deal, I looked this up not so long ago because I know someone who's parents have blue eyes and green eyes respectively. The children have green, blue, and brown. This seems impossible, right? Wrong.

Basically... when we speak genetically, there are three alleles for eye color. There is brown, blue, and hazel. Hazel can manifest as a hazel (sort of brown), green, grey, or even blue or green with brown spots or freckles in the eyes. So... if the parents have green eyes, they can have kids with dark hazel eyes, which might be mistaken for brown, but genetically speaking, they are hazel and the kids do not possess a brown gene because if they did they would have brown eyes.

The order of dominance is brown over hazel and blue, hazel over blue, and blue is recessive. Therefore, two parents with true blue eyes (not blue with brown spots, or grey... because that would really be hazel) cannot have children with brown eyes. Parents with hazel eyes (any manifestation of hazel) cannot have children with truly brown eyes, though the hazel eyes might look brown sometimes. Parents with brown eyes can have any combination as long as the parents are heterozygous.

So, to answer your question: green with green, or green with blue cannot produce a truly brown-eyed child.

Answer 2

Green and blue. It's simple genetics-- each human has two genes for eye color-- one from their mother and one from their father. Brown is a dominant color, and green and blue are recessive. So lets say a mother and a father both have brown eyes, but they each have a recessive blue eyed gene. So even though they have that gene, their eyes are brown. But because they have the recessive blue eyed gene, they can have a baby with blue eyes. The thing is, baby has to get the recessive blue eyed gene from both mom and dad, otherwise she'll have brown eyes. But if mom and dad both have blue eyes, there is no way to make a brown eyed baby because they only have recessive genes. If baby has brown eyes, you'd better start checking the milkman's eyes!

Anyway, that's the short answer. Check out this link for more information. http://www.thetech.org/genetics/ask.php?id=2

Answer 3

It is true that two blue eyed parents will only make blue-eyed babies. And if two people have brown eyes they can have a blue-eyed child because they could both carry the recessive blue eyed gene. But there are only genes for brown eyes and blue eyes. There is a totall different gene that determines how much of the brown pigment goes to the eye. So you could have the gene for brown eyes but you also have a gene that says how much of that brown will show up in your eyes. If that gene says a small amount of brown, your eyes will be hazel. The more brown allowed to go into your eyes the greener they will get.

Answer 4

If the mom and the dad both have blue eyes, the baby cannot have brown. All their babies will have blue eyes.
Here is how it goes: Blue eyes is: b
Brown eyes is: B
The B is stronger than the b.
Everyone has two genes for eyecolor: if your eyes are blue they will be: bb
If your eyes are brown it could be either: BB or Bb
Therefore a brown eyed parent can have a blue eyed baby, because some of them actually carry the gene for blue eyes, but not the other way around. Hope that is easy to understand

Answer 5

If my hazy memory of high school biology holds, the genes for blue eyes are recessive -- so someone with brown eyes can be carrying the essentially inactive genes for blue. 2 blue-eyed people would lack the genes for brown eyes, so can't have a brown-eyed baby (other than adopting or switched at birth). I don't know where all the hazel and green comes into play.

Answer 6

I believe 2 blue-eyed parents can not produce a true brown-eyed baby, but can have a baby with green or hazel eyes. Both my husband and I have blue eyes and all 4 of our children also have blue eyes.

Answer 7

I have green eyes and I am the mother of 2 brown eyed babies.

Answer 8

Two blue eyed parents cannot make a brown eyed baby since they both have both recessive genes. Mom is bb and Dad is bb so they cannot make Bb or BB for brown.

Answer 9

Eye color is based upon the parents' genes. There are dominant & reccessive genes. Brown Eyes is a dominant gene, meaning that if both parents have the dominant gene for it, then a child will have brown eyes. Hazel eyes are an example of a reccessive gene. If both parents have the recessive gene for hazel eyes, then the child will have hazel eyes. Remember: you can pass a gene to a child that you don't express. My parent both have brown eyes, but I have hazel. They each had recessive genes for hazel eyes that were passed to me, even though they don't express the gene themselves.

Answer 10

Blue eyes are caused by a recessive gene. Two blue-eyed parents can only have blue-eyed children.