If people go to Mars and cut off contact with earth, how long before the species of Human on Mars can no longer procreate with Earth Humans?

[Anonymous]

A few hundred years

A few thousand years

over a hundred thousand years

a million years or more

they will always be able to mate

[abc3643]

Ironically, probably a short time. While genetically, they'd probably still be able to do have kids, people raised in the lighter gravity of Mars will be a bit more fragile and not be capable of having robust sex with Earth-raised humans.

Frankly, though, it remains to be seen that humans can survive for a long period of time in low-g environments. Sure, in space, it may seem OK, but even a few years is not a lifetime. The body was designed through evolution to live in an environment in which the acceleration of gravity is "1 g" (or 9.8 m/s^2). A body existing in a different gravitational reality will function differently and biological processes which require gravity will be adversely affected.

Effect of spaceflight on the human body
en.wikipedia.org/.../Effect_of_spaceflight_on_the_human_body

[Anonymous]

Humans and chimpanzees diverged about 5 million years ago and can not procreate with each other.

Lions and tigers diverged about 4 million years ago and can procreate.

I'm not a scientist, so perhaps I'm very wrong, but I think they might be able to procreate for millions of years after. But it depends entirely upon how much their biology changes over the course of that time, which is a completely unknown variable that I personally can not predict, and I don't imagine many others can, either.

[jshm2]

They would still be able to procreate.

The main reason being the environment on Mars would need to be maintained as the environment of Earth. Therefore it would be as if they were still on Earth.

[007kingifrit]

i can't believe anyone answered a few 100 years HEY IDIOTS. populations already existing have been out of contact for 10s of thousands of years in some cases... can they still reproduce? yeah...

[Anonymous]

Oh come on, white woman breed with monkeys all the time.