'and if it were true that would all mean that we are brother and sister.. which would also mean that is where all these birth defects come from but that could also be aform of evolution.'
Ok, I would first reccommend that for the sake of humanity, at least take basic high school biology. Or maybe sit in the class at the very least and stare at the board.
Essentially, evolution works far better than any other thoery out there today, and speciation has been PROVEN. Take fruit fly generations. Scientists have created new strains of them because they can breed so quickly that are resistant to disease and genetic defects that stem from abnormal chromosomes. With that said, a word about LUCA, since someone brought it up:
LUCA stands for Last Universal Common Ancestor. Basically, it is the life form that everything has evolved from, if you accept evolution. Not to say it was the first life form on Earth, but just the one that prospered and divided into another, and another and another, and so on. However, the fact that all life forms are are thought to have come from one cell does not mean that birth defects are a form of evolution. Birth defects are usually chromosomally related, EG. XY/XX related. Fragile-X syndrome for example stems from a Chromosomal error in which the introns (Spaces in your DNA that do not code for anything, which is actually most of your DNA) get too long and unstable molecularily. Thus, the chromosome can snap off and genetic info is lost, leading to defects in the male, etc.
Birth defects dont create new species though. Speciation comes from genetic errors from random radiation that change the chromosomal (not XY/XX chromosomes) only slightly and usually unnoticibly. Change happens gradually, incredibly gradually in Evolution and speciation. Birth defects are sudden, harmful and usually involve the XY/XX chromosomes, and in almost all studied cases render the child incapable of passing on its chromosomes. Broken Chromosomes cant fix themselves (yet).
Also, if you simply take a step back and look at most, actually almost all birth defects, most dont give you an advantage. Thats why they're called defects. If it doesnt give you an advantage, the genes simply wont succeed into other generations and subsequent prodigy wont make it into the gene pool.
Darwin, the man himself, may have had shaky beliefs, but the fact still remains that his idea of speciation is proven and that the idea of evolution is by far the most accepted and the most plausible explanation so far in science to explain the diverse amount of species on our planet.
Evolution cant be proven for a good reason: it happens incredibly slowly over millions of generations. We wont know for sure probably ever, but its still the only theory that best describes life.
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Rowen
'Aren't you Buzz Lightyear?'
*whispers* 'I love your movies!'
'URAAAAFWAAAGAAA!!!'