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Reproductive isolation in artificial panspermia model

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Simulation of artificial panspermia, in inter-galactic travel, as a model for the study of reproductive isolation.

Case 1:

If we send a mass of proto cells(kept alive by some mechanism like cryogenic freezing powered by some perpetual engine) to another far galaxy's habitable planet, such that the cells are subject constant variations in its surroundings( the cryogenic system is made up of a material that transmits 99.9% of the incoming radiation like the the radiation of stars, and the cells are subject to gravitational wave radiations, relativistic speeds and so on), and set up early-earth-like conditions in a constructed area in the the new planet where the cells can grow into another human, (just like they did during the early evolution on Earth); would there exist a reproductive isolation between a human on Earth and the new Homo sapiens( say their new name to be- Homo galaxiants) if they tried to sexually reproduce?

Assumption: Our species survive during the travel of the cells. We, on Earth remain unevolved from the time the cells leave the Earth till the time a Homo galaxiant matures.The pollution levels, the climatic conditions, the species richness, rate of consumption, radiation of the Sun, etc., all remain the same on Earth so that the DNA can be subject to the same conditions both for an organism on Earth and for the travelling mass of cells( although this is subject to additional changes en route).

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This post was sourced from https://worldbuilding.stackexchange.com/q/63004. It is licensed under CC BY-SA 3.0.

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