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health advisory Hospital Doctor Yu 2007-11-8 19:08:58

Answers:

It's in the genes. Diseases are passed down to children through the alleles or traits they inherit from parents. The Law of Probability is very applicable in this situation. In addition, some of these conditions are controlled by dominant or recessive traits on a certain chromosome.

Another explanation may be that some people are asymptomatic carriers. An asymptomatic carrier is a person who is infected with an infectious disease or carries the abnormal gene of a recessive genetic disorder, but displays no symptoms. Although unaffected by the disease or the disorder themselves, carriers can transmit it to others.

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Although most babies are born healthy and disease-free, all expectant couples must know that certain diseases like haemophilia, cystic fibrosis, muscular dystrophy, sickle cell anaemia and thalassaemia are inherited.

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it is natural selection. so it is secured that not all human kind is dying from the same disease

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You must be asking about genetically inherited diseases. Yes, some children may get them but not others. The parents have two genes for each traits, one causing the disease and one not causing it, or in some cases they have two genes which both cause the disease. When each parent donates one genes to the child, we don't know which is donated until after the fact. So one child may get one (or two genes) that cause the disease. While their brother or sister may get two genes that don't cause the disease. Several factors are at work here, to really understand it I would suggest you look up Medal's Laws for genetics. I don't know if the disease you want to know about is caused by recessive genes (then you would need two of the same kind). If that is the case the siblings who don't get the disease are considered carriers.

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Diseases are inherited via many different routes. Some like hemophilia, sickle cell are carried directly on specific genes and so if that gene is not inherited then the child does not get the disease e.g. the disease is on one of the mother's two X genes and she gives her child the "good" X gene. Other diseases like diabetes, schizophrenia, alcoholism are not on any one gene that we have identified and so what the child inherits is the predisposition (or higher risk) of getting that disease than someone whose parents don't have the disease. In these cases the environment will also have some influence (diet, stress, smoking etc). So all these factors come into play with each child's conception.

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Listen to 'DrHue' above.

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I agree with lizbennett; it is all in the genes. For each child, there is a 50% chance that they will receive a certain trait from a certain parent unless both parents have it. These chances decrease as the family line continues: 100% to 50%, 50% to 25%, 25% to 12.5%, and so on. Diseases are inherited the same way. They may be a little more complicated, but I'm not exactly a biologist! Maybe DrHue is.

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some diseases skip a generation, so if a great grandmother had a disease, it would skip the grandma and go to the daughter--of course I'm not God ask Him He knows

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I think that Drhue's explaination is correct!Hey, Yu Ting! Time is running out so answer the question!

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