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Genes aren't typically considered "healthy" or "unhealthy", but I suppose a healthy gene might be equated with a gene with normal function. Mutations in genes can lead to defective genes, the sort of genes you might call "unhealthy". Normally, genes encode proteins that carry out important structural and functional processes within and between cells of the body. Defective genes might encode a faulty protein that can no longer carry out its normal task.
Whether the genetic mutation results in such a faulty protein depends on a number of things, such as the function of the normal protein, the type of genetic mutation, the activity of the faulty protein, etc. This might sound complex: it is. Understanding the difference between healthy and unhealthy genes requires quite a bit of knowledge about genetics, the relationship between genes and environment, how cells operate and communicate, etc. It's no easy task.
In your question you ask specifically about genes on chromosome 21. The discussion of genetic mutation doesn't need to be specifically targeted to genes on chromosome 21 unless you have a specific gene, mutation, or disease in mind. Since this is categorized under Down syndrome, I suppose you might be thinking of a single gene defect that could cause Down syndrome. I'm not aware of one, but this is no my area of expertise. Down syndrome is usually caused by trisomy 21 or a translocation involving chromosome 21. These two processes don't involve single gene defects, but rather duplication of a large number of genes within a single cell, which causes Down syndrome.
What else can I help you with?
Can a male be a carrier for hemophilia?
The gene for hemophilia is found on the 'X' human chromosome. However it is a recessive gene so if a woman (who has two 'XX' chromosomes) has one bad 'X' and one good 'X' she will not have hemophilia but will be a carrier .If she has female children and their father is not a hemophiliac, then half of her daughters may carry the bad 'X' chromosome but non will manifest the disease.However, if her children are male then her sons will have an 'X' chromosome inherited from her and a 'Y' chromosome inherited form the father and there is a 50% chance that the 'X' chromosome inherited will be the bad one. If the son inherits the bad 'X' he will be a hemophiliac and if he lives to father any daughters then all these daughters will be hemophilia carriers (because they must inherit his (bad) 'X' chromosome).It is possible for a woman to manifest hemophilia if the mother is a carrier and the father is a hemophiliac. In this case it is possible for a daughter to inherit the bad 'X' from the father and the mother's bad 'X' giving the daughter two bad 'X' chromosomes.
Why are males prone to colorblindness?
The classic red-green color blindness is carried on the X chromosome. Men get the x from their mother and the y from their father. If the x has the bad gene then they will be color blind. If a woman gets the gene from her mother she will be a carrier and able to pass it to her sons (or the carrier state to her daughters) but will be able to see because she has a good gene on the other x chromosome. There are other forms of color blindness that are inherited in other ways so women can be color blind.
Why Are males more often hemophiliac?
Hemophilia is a recessive, sex-linked, X chromosome disorder. It would have to be present on both X chromosomes to present in females. It only has to be present on the single X chromosome to present in males.
What is a mutation of a single gene?
by what protocol we can mutate a single gene from leishmania BY ANOTHER PERSON - The answer is POINT mutation. I'm doing the worksheet too LOL hahah everyone is doing miggis homework huh === Too bad I can't find the rest of the answers for that homework D: But yea it is Point Some genetic disorders result when a mutation causes the product of a single gene to be altered or missing. ~From my science book o-o lol
Does Fibrodysplasia Ossificans Progressiva have a bad chromosome?
The gene that is mutated in a person who has Fibrodysplasia Ossificans Progressiva is called the ACVR1 gene. A small mutation in one of the two copies of the ACVR1 gene modifies the meaning of its genetic message, so a defective protein is made.
What is bad about gene therapy?
don no
Is it bad to be anorexic?
it is not bad not is not healthy at all :/
Can you breed dogs to be blind?
Yes you could eventually. There is a blind gene in the dalmation breed. Normal ethical breeders would want to breed the bad gene out of their gene pool. This is putting it all very simply. Why would anyone want to breed a bad gene into their breed?
Is being heterozygous a serious medical issue?
Everyone is heterozygous at many genetic loci. It means the gene you got from your mother is different from the gene you got from your father. Since you got one chromosome (one gene) from each parent, there's a reasonable chance you'l be heterozygous in genes where there are different genes in the population. Depending on the gene, heterozygous can be an advantage - a "good" gene can overcome a "bad" gene.
Good gene and bad gene?
Gandhi suggested - see no evil, hear no evil and speak no evil.That is how we can switch off the bad genes! P.S. No feeding of any evil into the brain through our sense organs, no bad genes would express in the form of bad acts.
How can a child with cystic fibrosis have two parents that do not have cystic fibrosis?
The parents will both have a specific gene defect. If they do there is then a 1 in 4 chance of them having a child with cf. so if you are considering having children you should have a blood test to find out if you are a carrier of the gene causing cf. hope that helps.
Why does gene feel bad after finny falls?
he caused finny to be hurt
