0
There are two genes for the eyes - dominant and recessive. Brown eyes are dominant and one only has to have one of the dominant brown eyed genes to have brown eyes. In order to have blue eyes, one has to have both eye genes recessive. No blue-eyed person will have a brown-eyed gene, but a brown eyed person can have a blue eyed gene. Example : since brown is dominant, let "B" represent the dominant brown eye gene. Let "b" represent the recessive blue eye gene. The combinations for eye color (one gene from each parent) are BB, Bb, bb. Thus BB and Bb will always be a brown eyed person. bb can only be blue eyes because since blue eyes are recessive, one must have both blue eyed genes to have blue eyes (bb). Another example on what color eyes a child will have with one brown eyed parent and the other blue eyed : Mother BB or Bb (brown) - Father bb (blue). If the mother does not have one of the recessive genes (Bb), the child will always have brown eyes (Bb) because he/she will inherit the dominant gene B from mother and b from father (Bb), which is brown. If mother has brown eyes (Bb) and father still is bb, the combinations for the child are either Bb, Bb, bb, bb or 50-50 brown or blue. NO child can have brown eyes whose parents BOTH have blue eyes (bb and bb will only produce bb, which is blue eyes). In summary, BB and Bb is brown eyes and bb is only blue eyes. We inherit one gene from each parent.
Wiki User
∙ 14y ago
Wiki User
∙ 13y agoBrown eye gene = B
Blue eye gene = b
Each person has two copies of the eye color gene in their genome, one inherited from each parent. Now if both parents only carry the gene for brown eyes, BB and BB, then their child will receive one B from each parent, ending up as BB. The same works for blue eyes, if that's the only gene both parents carry, bb and bb. Each parents gives on b to the child, who ends up as bb.
If you have one parent who only has the gene for brown eyes, BB, and one parent who only has the gene for blue eyes, bb, then all the children will have brown eyes. Example: One parent gives a B, the other gives a b. Bb = brown eyes. Here's why: When you have two alleles (coding sequences) from genes that are at odds with each other, one version will override the the other. When dealing with eye color, B always dominates b. But these children now carry the b gene in them, and could pass it down to their own children. Some of them, depending on the other parent, could end up with blue eyes.
If one parent is Bb, and the other is bb, then each time they have a child, there is a 50% chance it will have blue eyes. Example: First parent is Bb, second parent is bb, then their children will end up as either Bb, bb, Bb, bb. If both parents carry the genes for brown eyes and blue eyes, then each time they have a child, there is a 25% chance it will have blue eyes. Example: First parent is Bb, second parent is Bb, then their children will end up as either BB, Bb, Bb, bb.
Wiki User
∙ 14y agoThe only way to check would be to do a punnet square. With this you can see the genetic probability of carrying the blue eye gene.
Here's a tip to help.
Both Parents have Brown Eyes = Brown Eye Child.
One Parent has Brown, One Blue = 25% Chance of having blue eyes. (Punnet Square below)
Both with Blue = 100% Blue Eyes.
(Other statistics like Parent's parents can change these percent)
Punnet Square for Brown Eyes, B, and blue eyes b.
Bb (Brown Eyed Person w/ Blue Eye Recessive Gene)
? ? ? ? B ? ? ? ?b
=============
?B | BB ? ? ? Bb
?b | Bb ? ? ? bb
Add your answer:
Earn +20 pts
Can Brown eyed dad and blue eyed mom make a blue eyed baby?
yes. if the dad has 1 recessive blue gene and 1 dominant brown gene then he can either pass on the blue gene or the brown gene.
What is a dormant gene?
A dormant gene is one that is present but inactive. An example of this would be when a baby is conceived by a blue eyed and brown eyed parent. The child will have brown eyes. This is because the brown eyed gene is dominant and the blue eyed gene will lay dormant.
What is an example of 2 alleles?
The blue eyed gene and the brown eyed gene in humans.
Can a blue eyed man and a brown eyed woman make a blue eyed kid?
Theoretically, a blue eyed man and a blue eyed woman cannot produce a brown-eyed child. The reason is that neither parent carries the brown-eyed gene. If the father or mother did carry the brown-eyed gene, the eyes/irises of that parent would be brown. The gene for brown is dominant over the gene for blue. However, two brown eyed parents can produce a blue eyed child. In that case, each parent with brown eyes must carry the gene for blue - the parents' eyes are brown because the brown gene is dominant over the blue gene. However, if the child inherits a blue gene from both brown eyed parents, the result will be blue eyes although both parents have brown eyes. In the case of one parent with brown eyes and one parent with blue eyes, there is a possibility that the parent with brown eyes possesses the non-dominant blue gene. If the child inherits the blue gene from that brown eyed parent, the child's eyes will be blue since the gene from the other parent with blue eyes will be blue. There is a condition known as heterochromia iridis where one eye is brown and one eye is blue. This condition is usually pathological on a neurogenic or inflammatory basis with the abnormality usually being in the lighter/ blue eye. Acquired heterochromia iridis that develops in an adult may suggest a melanoma of the iris in the brown eye.
Can a green eyed man and brown eyed woman have a green eyed daughter?
Yes. Blue eyes are a recessive genetic trait, which means that a brown- or green-eyed person can still carry a gene for blue eyes. In this case, the blue-eyed gene is recessive, or subordinate, to the green- or brown-eyed gene. To be blue-eyed, an individual must have a recessive blue-eyed gene from both its mother and father.
You have brown eyes but your sister has blue what causes this?
Well if you have brown eyes there is a gene in the family for brown eyes but if your sister has blue eyes there is both a brown eyed gene and a blue eyed gene in your family so you either got it from your mom or your dad
Is it possible for a person with brown-eyed parents and no recessive blue eye gene to have a blue-eyed child if their partner has blue eyes?
Yes, the child probably inherited the blue eyes from the person with blue eyes.
It is possible for a filipino brown eyed and a American blue eyed have a blue eyed baby?
It is highly unlikely, as the gene for brown eyes is dominant over the gene for blue eyes, and it's unlike the Filipino parent is carrying the blue gene. The baby will carry the gene for blue eyes, and if it's own spouse is blue-eyed, each of its children has a 50% chance of being blue-eyed.
Can people without the blue eye gene have blue eyed children?
There are two types of genes that brown eyed people can have. There is BB, and Bb. The blue eyed gene is bb. If two people are Bb, and they have a child, if the child receives the two bb from each person, then they will have blue eyes.
Are there more brown eyed people in the world than blue eyed?
NO. People with blue eyes do NOT have the brown eyed gene, if they did they themselves would have developed brown eyes instead of their blue as it is dominant. So two blue eyed parents can only pass the blue gene to their offspring.
Can a blue eyed mom and dad have a brown eyed baby?
Yes, if there is brown eyes in the family, then yes, it is possible.
Can brown eyed dad and hazel eyed mother make blue eyed baby?
Yes, absolutely. Hazel eyes is the combination of the blue and brown eye color gene. For instance, a blue eyed mother and brown eyed father could have a hazel eye colored child. So that means all hazel eyed children can have a brown eyed child because they carry the brown eyed gene in their DNA from their father, in this case.
