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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.
What else can I help you with?
How do dominant alleles recessive alleles differs?
Dominant alleles are the ones that show up in the phenotype. Recessive alleles do not unless both alleles are recessive, but can be passed on. For example: Tt , T=tall and t=short. Tall is dominant and short is recessive. You are tall and can pass on the short gene. Or, you can use black hair being dominant over red. Or, brown eyes being dominant over blue. Dominant can be seen on you and recessive can't.
How many dominant alleles do you need to inherit that particular characteristic eg brown eyes?
To express a dominant characteristic, such as brown eyes, you need at least one dominant allele. In a diploid organism, which has two alleles for each gene (one inherited from each parent), possessing either one or two copies of the dominant allele will result in the expression of that trait. Therefore, having just one dominant allele (heterozygous) is sufficient to exhibit the dominant characteristic.
What is the difference between dominant and recessive alleles on the basis of DNA?
Dominant alleles override recessive alleles. For instance, if there is both a dominant allele and a recessive allele present the dominant allele will be the trait that you end up with. If you have two recessive alleles, then you will have the recessive trait. :::::::::::::::brown eyes overrided blue eyes, because they are darker:::::::::::::::::: usually a darker color overpowered/override the lighter ones....i dont really know why but my science teacher said so......
How do combination of alleles on your genes determine your phenotype?
Your phenotype is a characteristic of how you look, for example if you have brown or blue eyes. You inherit one allele for each characteristic you have from you mom and dad. Say your mom gives you a blue eyes allele and your dad gives you a brown eyes allele. Since brown eyes usually dominate over blue eyes, you would most likely be heterozygous for brown eye color, and you would have brown eyes. This would be represented by Bb, the B standing for brown eye color, the dominant trait, and the b standing for blue eye color, in this case the recessive trait. So, depending on what alleles you receive from your parents, you may look different than, for example, than your siblings do because they got a different set of alleles. This is possible because your parents both have 2 alleles, but they only give you one of each, so if both your parents give, for example, your sister a blue eye allele, she will most likely have blue eyes, even if you have brown.
What Alleles are considered?
Alleles are different versions of a gene that arise due to variations in the DNA sequence. They can be dominant or recessive, influencing traits expressed in an organism. For example, an allele for brown eyes may be dominant over an allele for blue eyes. In a diploid organism, each individual carries two alleles for each gene, one inherited from each parent.
What is meaning of alleles?
An allele is the different forms of a gene. For example the gene for eye colour has the alleles; brown, blue, green etc. In every person there are two alleles for every gene but both alleles are not always the same. They can be dominant and recessive; dominant alleles are expressed no matter what other allele is present, recessive alleles require both alleles to be the recessive one to be expressed. E.g. say B is the allele for brown eyes and b is the allele for blue eyes. Brown is dominant therefore if someone had Bb or BB they'd have brown eyes and if they had bb their eyes would be blue.
What color eyes will the child have father has brown eyes and mother has black eyes?
It depends on the genes but most likely brown because the allele for brown eyes is dominant over all other alleles
What color eyes will the child have father has black eyes and mother has brown eyes?
It depends on the genes but most likely brown because the allele for brown eyes is dominant over all other alleles
Why did Hitler want to get rid brown hair blue eyed people?
Because the combination of brown hair blue eyes is strange. The person would get two dominant alleles for brown hair and two recessive alleles for blue eyes. It is not supposed to happen.
How do dominant alleles recessive alleles differs?
Dominant alleles are the ones that show up in the phenotype. Recessive alleles do not unless both alleles are recessive, but can be passed on. For example: Tt , T=tall and t=short. Tall is dominant and short is recessive. You are tall and can pass on the short gene. Or, you can use black hair being dominant over red. Or, brown eyes being dominant over blue. Dominant can be seen on you and recessive can't.
Why can a person with brown eyes carry blue eye alleles but a person with blue eyes cannot have a brown eye allele in their genotype?
A person with brown eyes can carry the blue eye allele because brown is a dominant trait, so they can have both blue and brown alleles in their genotype. However, a person with blue eyes cannot have a brown eye allele because blue eyes are a recessive trait, meaning they must have two copies of the blue allele in their genotype to express the trait.
If mother has blue eyes father has brown eyes and grandmother has brown eyes on mothers side?
If what you're asking is how did your mother get blue eyes, then I can answer that. Brown is the most common eye color, meaning that it is obviously the dominant allele. Your mother must have gotten two recessive alleles for blue eyes; it's the only way that the recessive blue wouldn't be masked by the dominant brown.
Is brown eyes dominate or is blue?
Brown eyes are dominant.
What is the difference between homzyguos and heterozyous?
Homozygous recessive: is when the genes are both recessive Homozygous dominant: is when the genes are both dominant (traits show) Heterozygous dominant: is when one gene is dominant and one is recessive (traits show) Heterozygous recessive: is the same as heterozygous dominant but the dominant genes are inactive
What is the difference between alleles and genes?
alleles are different variations of the same gene. For instance, one allele may give blue eyes, but another may give brown eyes, but both are the eye colour gene. (This is a simplification, eye colour is controlled by more than one gene but for the sake of this example let's pretend it's just one)
What is the difference between dominant and recessive alleles on the basis of DNA?
Dominant alleles override recessive alleles. For instance, if there is both a dominant allele and a recessive allele present the dominant allele will be the trait that you end up with. If you have two recessive alleles, then you will have the recessive trait. :::::::::::::::brown eyes overrided blue eyes, because they are darker:::::::::::::::::: usually a darker color overpowered/override the lighter ones....i dont really know why but my science teacher said so......
What is two dominant alleles called?
In eyes, it would be brown is dominant, and blue is recessive. Free earlobe allele is said to be dominant over the attached earlobe allele. When an organism has two dominant alleles for a trait, it is called homozygous dominant. Two recessive alleles for a trait is homozygous recessive.
