re: Adam and Eve. I believe we have a topic for civil discussion here.
Yes, I do believe that Adam and Eve had all the genetic information necessary to produce every variation we see today - remember the 1 with the 2017 zeros behind it - the number of possible genetically non-identical possible offspring. The number of hydrogen atoms in the universe is estimated on the order of 10^80th, just for comparison.
I’ve seen pictures of twins of “medium brown” people - one child white and blond, the other brown skinned/brown haired.
I also believe that the harmful variations, the harmful replication errors, mutations, even death itself, are a consequence of the Fall.
If you don’t want to assert Man’s wisdom (”reason”) over God’s literal Word, then there was no death, disease, mutation, or predation (all green plants were for all to eat) before the Fall. This precludes “theistic evolution”.
How could a perfect God create an imperfect human?