No. Evolution implies the creation of new codes and we are never witnessing that so it cannot explain origin of life.
Viruses increase the size of DNA in some cases and if the cell is a gamete then this increase in size is inherited. Down syndrome and its equivalents in other species do the same.
...all species. Additionally there are other processes which work on a more granular scale instead of duplicating the whole chromosome: http://tinyurl.com/yayeuk5r
No. I never said that. I said that there are many processes which can make space for more info in the DNA. While this specific process causes DS to humans, it's not always bad for...