I'd like to introduce you to a very valuable word. The word is
our. In some dialects this word may sound very similar to the word
are, but it is actually a completely different word. Proper usage of this word can help to clarify when you are talking about
our ancestors or
our genetics.
Hope my comment was helpful.
Oh, and yes, we do appear to have a genetic similarity with the great apes. We have 46 chromosomes (two 23 chromosome pairs) and other primates have 48 chromosomes (two 24 chromosome pairs). Yes, it appears as though human
chromosome 2 is a fusion of other primate chromosomes, which differentiates us as humans.
You ask the question of how, and it is a valid question; How indeed? Is not evolution an answer in itself? Or would you prefer to bring aliens into the equation as "the answer," much as
our ancestors brought Zeus or Odin into the equation as "the answer" for everything previously unexplainable like snow, lightning, volcanic eruptions, and eclipses?
We can't explain it, so aliens must have done it. Does that pretty much sum up your argument?