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And what makes different types of HIV appear? There are new strains of HIV now, that did not exist before. Where did they come from if they did not evolve in the bodies of hosts?

2006-12-29 07:29:44 · 11 answers · asked by ÜFÖ 5 in Society & Culture Religion & Spirituality

A weight lifter may adapt to his environment by building different muscles. But he does not grow different muscles. Furthermore his weight lifting does not change his DNA, so his children still inherit the same genetic codes from him regardless if they were born before or after he started working out.

Different types of HIV have emerged, which means the DNA has changed. Since virui don't mate, what accounts for the change?

2006-12-29 07:39:06 · update #1

11 answers

Why does a weightlifter grow bigger muscles the more he lifts weights? Does he cease to be human? Does he become a new species of animal? Does he develop new appendages to lift weights with?

2006-12-29 07:33:18 · answer #1 · answered by firebyknight 4 · 1 1

The changes in HIV virii are due to mutations. Mutations have several causes, such as natural or artificial radiation, disease, or gene-copying errors. In a larger creature, most mutations usually produce a very small difference in the creature's characteristics. But a virus is so simple that any mutation is likely to have a profound effect on its behavior. The rest is up to natural selection. If the change alters the shape of the molecules the virus uses to unlock host cells, it may become more virulent or it may become unable to invade at all. It may no longer react with a formerly effective drug.

Consider the "bird flu" virus scientists are concerned about. So far, it's not a serious threat to humans. But a random mutation could alter the virus' shape to make it easily transmissible from humans to humans. That could be a disaster. "H5N1" is a name for the current virus that indicates 5 Hydrogen molecules and 1 Nitrogen molecule on its infective surface. Should a mutant virus, an "H4N1", an "H5N2", or some other arrangement of "H5N1", prove to be more universally infectious, a pandemic could result. Prevention efforts are directed at avoiding too much inter-species contact, especially body fluids, not because the predominant virus is especially dangerous now but because of the mutation opportunity that would be presented by an infected human. Some humans are susceptible now, but the virus doesn't transmit easily between humans. A virus that develops human transmissibility may not survive if its host is a duck. But if it becomes humanly transmissible in a human host, the pandemic is a very real hazard. So people who get bird flu are isolated and examined to make sure that they are not infectious beyond people with very similar makeup (family members, for example).

Our HIV virus has not learned a new trick. The drugs have been working, but a mutation occured and the descendant virus was more resistant to the drugs, and now there are more of its descendants present in the host than of the ones who weren't resistant. We still call it HIV because it still acts that way, but a point could be reached where it could be considered a separate species. (The question is, would we be able to tell where the new virus came from?)

The phrase "99.9% effective" is a cruel joke when it comes to microbes. The 0.1% of resistant microbes can replace the dead ones within days or hours. The only effective antibiotics have to be 100% effective. The alternative is finding ways to make us more resistant to them.

2006-12-29 19:04:57 · answer #2 · answered by skepsis 7 · 0 0

HIV is an RNA virus. RNA is not as stable as DNA, and its replication through reverse transcriptase does have anywhere near the error checking of DNA replication. The generation time for the virus. This all means mutation.

If you are taking an antiviral medication and have one mutant appear that is not affected by one of the antivirals, it will have an advantage and the resistant strain will amplify in the body. That is natural selection. The use other antivirals will keep it from growing. That is the basis for multidrug therapy.

2006-12-29 18:09:06 · answer #3 · answered by novangelis 7 · 0 0

Alas, you have fallen victim to the Myth of Popular Evolution that insists improvements lead to new species. The scientific, biological theorem of Evolution, on the other hand, is a theory about changes. You don't see the difference? I thought not...

The Myth says everything (including reason) is simply the unforeseen and unintended by-product of a mindless process at one stage of its endless and aimless becoming. Your HIV virui are still HIV virui. They have not evolved. They have adapted to a life-threatening attack (antibiotics etc). But they are mindless and purposeless except to exist. They simply devote themselves to reproducing. That tells us more about the Force of Life at work in the universe than it does about evolution. It's not a problem.

2006-12-29 15:47:59 · answer #4 · answered by Anonymous · 0 1

the hiv virus evoles to become resistant to the drugs it prouves evolution it mutates

2006-12-29 15:45:46 · answer #5 · answered by andrew w 7 · 0 0

I don't know if that confirms evolution but it is certainly the best point I have heard in a long time. Very good point.

2006-12-29 15:59:50 · answer #6 · answered by Anonymous · 1 0

Ever hear of Macro Evolution and Micro Evolution. But what you ask has nothing to do with your subject.

2006-12-29 15:37:01 · answer #7 · answered by Ex Head 6 · 0 1

Well since God is constantly creating and he made HIV to kill us he has to be as creative if not more creative than we are.

2006-12-29 15:32:29 · answer #8 · answered by Anonymous · 1 1

Because drugs kill people. I'm talking about the OTC medicines and prescription drugs.

2006-12-29 15:36:36 · answer #9 · answered by Cold Fart 6 · 0 1

Probably, man made.

2006-12-29 15:34:14 · answer #10 · answered by Anonymous · 0 0

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