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How does eye color pass to the young?
It is because of an inherited phenotype, a phenotype is the outward expression of genes. the source of the inherited phenotype is dependent upon whether mother or fathers genotype is consisting of dominant or recessive allele i.e a dominant allele if pair with a recessive will be the one inherited. Check the site out in the related links below for an Eye Colour Inheritance Chart.
What is A version of gene is called?
Particular Versions of Genes are called Alleles - one way they differ is that some alleles are termed to be dominant while others are termed to be recessive.
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.
How are alleles different from genes?
A gene is a section of DNA that codes for a specific protein. An allele is the different forms of that gene. The commonly used examples are things such as eye colour (although this is an over simplification as the true nature of the genes governing eye colour are a little more complex): You have a GENE for eye colour. That GENE comes in (normally) two forms. These two forms are called ALLELES. One ALLELE is for blue eyes and one ALLELE is for brown eyes. ALLELES can be DOMINANT, RECESSIVE or CO-DOMINANT.
What is the meaning of the word allele?
The term allele is different from a genotype because an allele can be singular, but the alleles that an individual (diploid organism) has at a certain locus are called a genotype.
Are blue or brown eyes dominent?
brown eyes are dominant and are the most common eye colour half of the world has them population have them including me
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?
Because the brown eyes allele is the dominant one.
What is dominant and recessive allele?
A dominant allele is an allele where its phenotype will always be represented when the allele for that gene is present. A recessive allele can be masked by a dominant allele when a dominant and recessive allele are present for the same gene. A recessive allele will only present itself when two recessive alleles for a trait are present.
How do you explain the principle of dominance?
Genetic dominance? One gene is dominant over the other gene in the chromosome pair by having it protein product made totally at the expense of the recessive gene, or the protein product dominates production. For instance, blue eye color is recessive to brown eye color. You have two alleles ( different molecular form of the same gene ) in this case; one from one parent and one from the other parent. Only the brown allele expresses and is called dominant then.
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)
Can several alleles affect a single trait like eye color?
Alleles affect traits like eye color. Alleles for brown and blue eyes are dominant and recessive respectively. Individuals who have homozygous and heterozygous genotypes with the dominant allele will have brown eyes. However individuals are homozygous for the recessive allele will have blue eyes.
What does recessive allele mean?
Recessive allele disorders are just as they sound - they are disorders that are a result of a prevalent recessive allele in one's genetic makeup. A recessive allele disorder will rarely occur since it is dependent on the crossing of two heterozygous parent cells, but it can lead to interesting consequences. An example of a recessive allele disorder is hemophilia - the body's inability to clot blood - and it has affected much of the European royalty in history, such as Queen Victoria of Great Britain.
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.
Is eye color a homozygous recessive genetic disorder?
Blue eyes - homozygous recessive Brown eyes - homozygous dominant Brown eyes with one brown allele and one blue allele - heterozygous
What is the difference between homozygous and heterozygous organism?
it's to do with genes, a homozygous organism has two alleles that are the same, whereas a heterozygous organism will have two different alleles. eg, on a chromosome for eye colour, a homozygous example would have both alleles for say, blue eyes. a heterozygous example would have an allele for blue and an allele for brown, where brown would be dominant, reccesive, or cooperative.
Can blue eyed parents have brown eyed child?
Normally, no, they can't. This is because the allele for blue eyes is recessive, whereas the allele for brown eyes is dominant. Since both parents have blue eyes they are both homozygous recessive ie. carrying only blue eye alleles. Since both parents only carry the blue eye allele they can only pass blue eye allele on to their children. BUT, there is a fractionally small possibility that a spontaneous mutation could occur in the eye colour gene in one of their gametes that would change an allele for blue eyes into an allele for brown eyes. If this gamete then takes part in fertilization then the resultant child will have brown eyes because they are now heterozygous (one blue eye allele, one brown eye allele) with the brown eye allele being dominant. ALSO, it could happen if one of your prospective parents is a chimera - a person who has effectively two genotypes because their cells originate from two different zygotes. If one of your prospective grandparents had brown eyes and gave a brown eye allele to one of this chimera's genotypes (the one responsible for forming gametes) while the other genotype of this chimera (the one responsible for forming eyes) had only blue eyed alleles, this blue eyed person could form gametes with brown eye alleles and hence have a brown eyed baby. Human chimeras are extremely rare, but an example would be Lydia Fairchild. Isn't genetics wonderful?
What is the difference between a dominant and recessive allele?
Dominant is an allele that can be expressed in a heterozygous individual (ie. Bb) or homozygous dominant (ie. BB). Recessive on other hand are traits that will only be expressed in a homozygous recessive (ie. bb) condition. Under normal circumstances, dominant alleles are the ones expressed in the phenotype, while the recessive allele is not. For example (an extremely simplified example) an heterozygous individual for eye color. (genotype Bb), has one dominant allele, 'B', and one recessive allele, 'b'. Given that B is for brown eyes, and b is for blue eyes, that individual's phenotype would be expressed as brown eyes (and be recessive for blue eyes). Organisms receive one allele for each trait from each parent, thus you have two alleles for each trait.
