Here's an experiment: take two zygotes from each of two animals, and do a DNA swap. That's 2x2 combinations of environment-DNA pairings. Compare the 4 offspring

Here's an experiment: take two zygotes from each of two animals, and do a DNA swap. That's 2x2 combinations of environment-DNA pairings. Compare the 4 offsprings. If this can be done, it has been done a million times already, I presume. What's been observed?