Reproductive Isolation in Humans?.......

[sachin]

If we consider that if ...

1.No inter religious marrige took place....(As rare now days too)

2.No migration of country men ...

Can humans from differant religiions get Reproductively isolated as "Darwin" stated for other organisms?

else if no Ammerican marries with Japanies then would they get reproductively Isolated?

I was just surprised........

[jimmystang]

um this is only if, say, a massive global conflict prevents ppl of different ethnic/religious backgrounds from mating (hopefully not), otherwise, there is much genetic flow for isolation to occur.

but even if there is no inter-mating between people of different backgrounds, I doubt that reproductive isolation or some sort of bizarre isolation would develop because there is too many of us in each culture for genetic drift to occur, and the environment in many countries is similar.

that is, unless a few people migrate to the moon..

[Oscerot]

I think I know the answer to my question, but it's locked away somewhere in my brain.

How does reproduction between relatives eventually produce genetic deformities?

[jimmystang]

genetic deformities don't come out of nowhere, i think.

the dangers of inbreeding are caused by the fact that the genomes of relatives are quite similar. Therefore, if there are certain recessive traits (unhealthy ones) that one is a carrier for, there is a high chance that your relative will carry that recessive allele too.

and having two recessive alleles for most genetic disorders means bad news

[AstusAleator]

Even if religion or some other fundamental ideology made interbreeding illegal or frowned upon, I think it would still happen. Perhaps ideological differences compounded by geographic seperation and language incompatability would do the trick...
Still, humans always seem to find a way

A neat example of human reproductive isolation is that of the pigmies and the bushmen of the Kalahari in Africa. If I remember correctly, they lived in neighboring territories. The bushmen were some of the tallest people in the world, and the pigmies were, of course, the shortest.

[sachin]

Its interesting ............ I need More now........

[Darby]

You need a lot of isolated generations before you'd see much change - and you do see some of that, in racial differences and features such as lactose tolerance - but the different environments people are in (or the lack of differences, given our tendency to alter the environment to fit us) are what would really push genetic shifts, and the differences just aren't that great.

If we isolated a population on Mars, or the Moon, then you might see some dramatic shifts - but even then it would probably be centuries, so "see" isn't really the right term.

[horsebacker17]

Talking about human reproductive isolation, it would be unbelievably hard for this to take place, but it could be possible. If lots of a population got a certain disease that caused them to become sterile or not reproduce successfully then that could cause a shortage in a population. Then if people started dieing out because there wasn't medical attention, that would help the population shortage, but in most lucky places, there are. Or if there was more of one genotype that was beneficial over another genotype but most of the population and "breeders" were passing off the bad genotype to the rest of the offspring. Then if there was a strict no interbreeding, that could help with a shortage but that's highly unlikely since rebellion is big nowadays, so as you can see it would be incredibly hard for reproductive isolation in humans.

[sachin]

But in country like India..... religious interbreeding cases are to less..... and vast population obeys the ancesteral line of religious marriges..... so can that matter for isolatiion?

[Darby]

Cultural isolation can produce reproductive isolation, but how much impact that would have on the population is difficult to predict. There are too many other factors that would be important. And, of course, the first one is, how complete is the isolation?

[Doc44]

A neat example of human reproductive isolation is that of the pigmies and the bushmen of the Kalahari in Africa. If I remember correctly, they lived in neighboring territories. The bushmen were some of the tallest people in the world, and the pigmies were, of course, the shortest.

Somebody would put 'em up to it.

Doc44

He said bushmen

[sachin]

You are right Darby....... I was searching for that word "Cultural Isolation".....