Originally posted by rooktakesqueen
well yes actually... by most chances it means you will... in fact, a lot of illnesses can be diagnosed from birth by studying dna, not all though of course. if you dont believe me facts speak for themselves, to use your example, a history of heart problems in the family will by most chances be carried to the next generation, this is passed through in ...[text shortened]... part of our character is made up of our dna from birth and you say this is not very useful...!
I think what ammanion is saying is correct, but you two are confusing each other.
Okay, for an example. Let's imagine I was born with a gene which gave me a predisposition to become a millionaire. Sounds silly, I know, but it is (a) merely a hypothetical example and, (b) a possibility - it could work by stimulating me to work hard, or have an especially grasping nature or by allowing me a good insight, that I may play the stock market. However, it doesn't necessarily mean that I WILL become a millionaire. I may be born in a time when money isn't invented. I might be born into an area where it's very hard to make it. I may suffer a childhood illness and be confined to hospital for the rest of my life. The gene makes it MORE LIKELY, but not certain.
Same is true with heart disease. Some people have a genetic predisposition to have a heat attack. That said, they may live a healthy lifestyle, keep their stress and cholesterol down and die as an old man or woman from old age. Or they may get cancer, or they may walk out in front of a bus.
It's important to understand that genes operate within a physical and chemical environment, which is every bit as important for the outcome of the individual as the gene itself.