and then, on 15 April 2012 - 01:05 AM, said:
It's a valid point but I wonder where the great diversity of DNA came from?
There is no great diversity of DNA. There is a very small diversity, and most of it is superficial. Only a 0.1% difference exists between all humans in existence.
If the genome were a book, every person's book would contain the same paragraphs and chapters, arranged in the same order. Each book would tell more or less the same story. But my book might contain a typo on page 303 that yours lacks, and your book might use a British spelling on page 135 "colour", where mine uses the American spelling, "color."