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Why is it possible for a man to be a carrier with a recessive genetic disorder but not with a sex-linked disorder?
Wiki User
∙ 14y ago
The body has 23 pairs of chromosomes. There are numbers 1-22, then the 23rd pair are the sex chromosomes. Females have two X chromosomes, making them XX, men have one X and one Y, making them XY.
The principle of a genetic disorder, let's call it "p", is that if someone has one normal, dominant chromosome "P" and one disease-causing, recessive chromosome "p", they are a carrier for the disease, but don't actually suffer from it (effectively the "P" overrides the "p").
Sex-linked disorders are carried on the X chromosome. If a woman inherits one normal X and one X with a recessive disease on it, she will just be a carrier, as she always gets two X's. Men on the other hand are XY, any disease they inherit on their X chromosome will present because they don't have another, potentially normal, X around to override the diseased one.
Hope this helps. :)
Wiki User
∙ 14y ago
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How is a carrier different from a person who has genetic disorder?
A carrier means that you have the gene for the disorder, but because the gene is recessive (meaning that it only shows when you have two recessive genes) and you obviously have a dominant gene as well, you won't show the disorder. Someone who actually has the disorder has two recessive genes. D = dominant gene r = recessive gene Dr = carrier, no signs rD = carrier, no signs DD = not a carrier, no signs rr = has the disorder
Can a person be a carrier for a dominant genetic disorder?
Anyone can be a carrier of a recessive genetic disorder (as long as it is not associated with the sex chromosomes) no matter what their gender since "carrier" refers to an individual that is heterozygous for the recessive allele and therefore phenotypically normal. Specifically, sexlinked genetic disorders can be "carried" by a heterozygous female but males (having only one X chromosome) cannot. Males will either be free of the defective gene or be affected.
Who is a person that is a carrier for a sex-linked recessive disorder?
Usually female.
Is cystic fibrosis dominant or recessive?
Cystic Fibrosis is recessive. If you have one CF gene and one non-CF gene, you will be a carrier but not have CF.
If you were a carrier of one allele for a certain recessive disorder how could genetic counseling help you prepare for the future?
Well, genetic counseling usually tells someone the consequences of their recessive disorder.
Why can an individual be a carrier but not have that disorder?
Yes because most diseases or disorders are recessive and therefore there can be carriers that are normal.
Is alkaptonuria caused by a recessive or dominant allele?
Phenylketonuria is an autosomal recessive genetic disorder. The enzyme phenylalanine hydroxylase is necessary to metabolize phenylalanie, but when this enzyme doesnt work, phenylaline accumulates and is detected in the urine. The disease is detected during pregnancy, and if treated right away the newborn can develop normally. However, if left untreated, the brain will not develop properly.
You can be a carrier of a recessive gene as part of your?
You can be a carrier of a recessive gene as part of your genotype.
A female who is a carrier of Fabry's disease has what chance of having a daughter who is a carrier?
The mother has a 50% chance of passing the defective recessive gene to her daughters who will be carries of the disorder (like their mother).
A carrier of a genetic disorder who does not show symptoms is most likely to be to transmit it to offspring?
A carrier of a genetic disorder who does not show symptoms is most likely to be heterozygous for the trait and able to transmit it to his offspring. The term heterozygous refers to a pair of gene with one dominant trait and one recessive trait.
Is a person who is homozygous recessive for a recessive genetic disese a carrier?
As long as a persons genotype consists of at least one recessive gene, they can pass it on to offspring to give them the disease, which makes them a carrier. Since this persons genes are both recessive, it is definite that they will pass on the recessive gene.
An individual with a recessive allele for an undesirable trait is called?
It is called "carrier".
