blue eye color possible only if both parents are blue eyed?

Question

Are blue eyes possible only if both parents are blue eyed since for blue I hear that all four alleles must be blue. Is that true? If one parent is blue eyed and other black then the kids eyes can be any color but it cant be blue. Is this so?

Answer 1

No, one parent can have brown eyes because if that parent had one parent of their own with blue eyes then they carry the blue eyed gene and you just don't see it because it is recessive so it's possible that they could pass that blue eyed gene on.

Answer 2

Not really, because I'm guessing blue eyes is a dominant allele. If so, and let's say for example, a man and a woman has four children; one parent has blue eyes and the other green, then 3/4, which = 75% of the children will have blue eyes and 1/4, which = 25% will have green eyes. In conclusion to all this, the phenotypic gene cannot be determined only if both parents have the same gene, but also by the recessiveness and dominantness of the allele of those genes.

Answer 3

According to mendels research no
Eye color a a phenotype of many genes, and not jsut one.

A simple way to show this is

Lets jsut make it so that the genotype for
blue eyes is "b" and
brown eyes is "B"
Brown eyes are dominant.
To get blue eyes you need to inherit the lower case b's so its "bb"
Say the male has a genotype for the blue eyes of Bb
And the female has the genotype of Bb
The parents have brown eyes, but the child can still get blue eyes
The child has a 1/4 percent of being blue eyed

If one parent, say the male was heterozygous brown eyed, "Bb"
and the mother was blue, "bb"
The offspring will stil lhave a 1/4 chance of being blue eyes, since Bb will only make the offspring heterozygous Brown eyed.

So it is still possible for the child to have blue eyes if:

Both parents are blue eyed
One parent is heterozygous brown eyed and one blue
Both parents are heterozygous brown eyed

It is not possible if both parents are Homozygous "BB" brown eyed

Answer 4

No, this is not so.
When both parent have blue eyes, then it is 100% sure the kid will have blue eyes, as all possible alleles combinations are still blue-blue.
But when both parents have brown eyes with mixed alleles brown-blue, there is 1 chance out of 4 that the kid will receive the blue allele from both parent and have blue eyes. There is also a 1/4 chance that the kid will have brown-brown alleles, and 1/2 chance the kid will have brown-blue alleles (and thus brown eyes).

Answer 5

If the parents have both blue eyes, then the baby has a 90% chance that the baby will have blue eyes. For example, if 1 parent has blue eyes and the other has brown then the baby's eye color would probably be light brown.

Answer 6

no, thats not true...lets say the mother is blue eyed which means she must have at least two of the recessive genes and the father is brown eyed...he may be brown eyed but if he has a parent with blue eyes he may still be carrying a recessive gene, he doesnt show because he only has one, but he could still very easily pass it on to his offspring

Answer 7

No, eye color is actually not as simple as they used to think. There are cases of blue eyed parents giving birth to brown eyed children and vice versa.

Of course this color variation is mainly amongst caucasians.

Answer 8

Hi,

No. If each parent has a dominant gene, say for brown eyes, and also has a recessive gene, say for blue eyes, both parents can have brown eyes because of the presence of the dominant gene in them. But, if they both contribute the recessive eye gene to their baby, it will have both recessive genes for blue eyes and will then have blue eyes, unlike either parent.

Answer 9

however blue eyes are a dominant genetic trait, and green eyes are a recessive genetic trait, there is the prospect which you are going to have won a recessive genetic trait from the two mum and dad. basically because of the fact they have blue eyes, does not adult adult males that their genetics won't be able to additionally incorporate genes for green eyes. working example in the event that they each and each have 4 genes that make up eye colour, and 3 out of four (3/4) genes they convey are for blue eyes, and a million/4 is a gene for green eyes. then you definately've a gamble of 6/8 for blue eyes, and 2/8 for green eyes. you have fallen in that final class, and won a miles less dominant gene from the two mum and dad. it relatively is how they are able to have blue eyes, and yours could be green.

Answer 10

I've seen mixed race people and darker skinned people like Afghans with blue or even green eyes. But, Im not sure if they wore contacts. All I know is that mothers genes are dominant when it comes to hair and eye colour.