Plus they only had son, so...

If you are a reader check out the books The Daughters of Eve and In the Footsteps of Eve. Fascinating in-depth looks at human genetics. The short story is that a vast majority of us can trace our lineage to 9 matriarchal lines( what the researchers poetically call the daughters of Eve)

No

The person referred to Adam and Eve story as myth but gives good explination of the story.

Original language and meaning can and does change even a slight bit. The person in video discusses the fruit of the tree of knowledge of good and evil as being fig not an apple.

I say, if a tree is called knowledge of good and evil, what might the fruit be; An oxymoron, good evil or evil good.

I recommend this video to start to better understand what the original language was talking about compared to what was translated into English.

No, because men (and all other male mammals) have nipples.
Let me explain; I had a right-hand drive Volvo car with the bonnet/hood release on the left-hand side. This is because whilst they had to move all the essential controls over for the UK and other sensible counties markets. it was not cost-effective to shift the release catch as well.
Genetically, females are the blueprint model and males the specialist ones. So Eve would have come 1st.

As to Adam and Eve: Do you understand evolution? What I think you might be asking is:
could 2 different gene pools evolve separate for many generations but then come together and be genetically compatible?

Trying to make an an analogy: spider monkey and a gorilla may have genetic origins. But what if after spider monkey and gorilla genetics seperate so that they would not be compatible BUT they then evolved so that some people evolved from spider monkey and some people evolved from gorillas but the people now are genetic compatible? I don't think this would happen, but soulds a little like what you are asking.

It is like; who was the first homo sapien couple that carried the specific homo sapian genetic? Their offspring being the only carrier of homo sapian genetics.

If one person has a specific but different genetic where that the person is still capable of having offspring with a mate of the previous genetic. Then that one person could be the start of it being that persons genetics to become what is the homo sapiens genetic AND only those that are genetic decendents of that one person would have the genetics. It takes people with the genetic change interbred with those compatible but passing on the specific genetic. Then what might would have to be seen would be that some 100s of generations later everyone alive is a decendent of the one person that had the genetic change or if there are still people that do not have the specific genetic it could show to develop into a seperation of cross breeding capabilities.

Mule the offspring of a donkey and a horse (strictly, a male donkey and a female horse), typically sterile and used as a beast of burden.

Donkey and horse can have an offspring but that offspring cannot have offspring.

No, not as applied to our current lifespans. You forget that in OT times of the beginning people lived up to 1000 years. Noah was 600 when he built the Ark. Now if you believe that I will tell you another story.