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Brown 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.

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Related Questions

What is the probability of them having a blue eyed child?

The probability of having a blue-eyed child depends on the genetic makeup of the parents. If both parents carry the recessive allele for blue eyes (Bb), where "B" represents the brown eye allele and "b" represents the blue eye allele, there is a 25% chance of having a blue-eyed child (bb). If one or both parents have brown eyes but carry the blue eye allele, the probability may vary. If neither parent has the blue eye allele, the probability of having a blue-eyed child is 0%.


Can a blue eyed male with both his parents having blue eyes marries a brown eyed female with her mother having blue eyes and her father having brown eyes could they have a brown eyed child?

Yes, it is possible for a blue-eyed male and a brown-eyed female to have a brown-eyed child. Eye color is a polygenic trait, meaning it is influenced by multiple genes. Both parents can carry genes for brown eyes, and if those genes are passed on to the child, they can have brown eyes even if neither parent has brown eyes.


How is it possible for two brown-eyed parents to have a blue-eyed child?

It is possible for two brown-eyed parents to have a blue-eyed child if both parents carry a recessive gene for blue eyes. When these recessive genes are passed on to the child, they can combine to produce the trait of blue eyes, even if the parents themselves have brown eyes.


If parents have Blue and Brown eyes what will the child have?

any color


What if your eyes are blue and your girlfriends eyes are brown Will your child have blue eyes or brown eyes?

You have a better chance of brown, because brown is dominant. If one of your girfriend's parents have blue eyes you have a The your girlfriend is a carrier of the recessive blue eyes gene and there is a 50% chance that your child will have blue eyes. If neither of her parents had blue eyes but one of their parents had blue eyes there is a 25% chance your child will have blue eyes. But statistics do not generally apply perfectly to real life, because life is fairly random. So it's better to say your chances SHOULD be 50% of having a child with blue eyes if one of your girlfriends parents have blue eyes, and your chances SHOULD be 25% etc.....


Ifa woman and man both have brown eyes but their first child has blue eyes what are the chances that their second child will have blue eyes?

If both parents have brown eyes, it means they both carry the dominant brown eye color gene. However, if their first child has blue eyes, it indicates that both parents carry the recessive blue eye color gene. The chances of their second child having blue eyes would be 25%, as both parents would have to pass on the recessive gene for blue eyes.


Can a child get brown eyes if parents' eyes are hazel?

Yes, it is possible for a child to have brown eyes if their parents' eyes are hazel. Hazel eyes are a combination of brown and green eye pigments, so if the child inherits the brown pigment from both parents, they would likely have brown eyes. Eye color is determined by a combination of genetic factors from both parents.


If a child has blue eyes and both her parents have brown eyes what does that tell you about the trait for blue eyes?

That the trait for blue eyes was recessive in both parents.


What is blue child?

Blue childeren are FROM both PARENTS HAVING negative blood hence blue blood.


A child has brown hair and brown eyes His father has brown hair and blue eyes His mother has red hair and brown eyes The best explanation for the child having brown hair and brown eyes is that?

The child inherited both the genes for brown hair and brown eyes from both parents, as brown is likely a dominant trait in this case. The child also carries the genes for blue eyes from the father and red hair from the mother, but the dominant brown traits are expressed in the child's appearance.


How come both of a child's parents have brown eyes but the child can has blue eyes?

Your wife had an affair; simple.


If both parents have brown eyes will there child get brown eyes to?

Sometimes. It depends on the ancestrial origin of the parents. For example, if the mother of the mother had blue eyes, the baby may be prone to adopt blue eyes. None of the parents, as far back as can be traced, could display the blue-eyed trait and the child still have blue eyes, since it's recessive. It is all genetics, since blue eyes are the recessive trait, they may have been passed down from generation to generation, and just not paired with another recessive gene. The odds are slim, but it's possible. Basically, it depends on the parents alleles. If either are homozygous dominant, the eyes will definantly be brown. If they are both heterozygous, then the eyes may be blue, but they may also be brown. There's a 25% chance in that case for blue eyes.

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