Hi
If magically, for some reason, the one medication a person needs to survive disappears - well then, evolution takes over.
well not quite ... but as you mention later reduction of passing on the genes is sorted out.
what I am not certain of, is this a recessive gene or not?
Given a long enough timeline and no development of modern medicine, the worlds population of humans would be far smaller and would not include many adults with any kind of severe presentation of BAV.
I sort of disagree. It has only been in the last 100 or so years where we have taken real strides in progress. I would argue that the reason more humans exist now is the benefits in stuff like:
* basic hygene (washing your hands) in removing disease
* clean and abundant water supply
* effective and efficient waste disposal (we're not up to our necks in feces)
* much more abundant food supply (first the agricultural revolution, then the industrial revolution, and then modern transport helped that)
* the treatment of infections with (at first) sulpha drugs, and later antibiotics
Its the base 10% of the medical arsenal which has a very long (often centuries) history which lifts us up out of squalor.
BAV would continue to exist, as long as presentations mild enough to allow those individuals time to procreate existed.
perhaps, but then it could equally be argued that our transition from hunter gatherer through to agriculture removed the need for the sorts of fitness that (say) an animal that must evade prey (like a rabbit or a deer) must poses (or die sooner). Our cooperative (tribe) system enabled us to become a collective and spread the load on any individual while the group remained prosperous.
So its possibly this which created the situation perhaps thousands of years ago which enabled the genetic drift towards allowing such issues to prosper.
Without modern medicine, I would have been removed from the gene pool long before having kids.
me too, I had my first OHS at about 10 so its unlikely I'd have made 20. Even less certain that I would have attracted a mate.
There is a bunch of thought in this area, one such branch of that is called Eugenics. One could argue that it was the influence of the Eugenics movement which perverted the Nazi party in the 1930's.
Another group consider that understanding the genetic makeup (with an eye to manipulation of it) of humans to be the way to get around this. I started my Biochem studies back in the 80's motivated by my own circumstances and not wishing to pass on a gene to my children.
In the end it didn't matter. My wife passed away and I don't have children.