The scientist who published the wrong number of chromosomes to be 48 made another error in 1930 when he made a suggestion that mongolism as it was called then was caused by an extra chromosome and even went ahead to submit a chromosomal material to a painter. The error was detected when the painter could not find any unusual distinction because the scientist did not see the extra chromosome 21 (Gilmore, Peakall, amp. Robertson, 2003). In addition, the faults resulted from the primitive scientific methods of the time and not the painter’s eyesight, this was proved on the onset of the discovery of the mysterious salivary glands chromosomes in the Drosophila larvae. According to Schneider, (2007), it is also important to note that a serious discovery of the Chemical mutagenesis had been found during the world war but unearthed in the 1950’s. a series of recombination of bacteria and viruses took place in 1950 to result into formal genetics and this lead to the coming of the gene. Although the evidence of DNA had come out strongly, most scientists still thought that a gene was a mere protein. Before it could be realized the Watson – Crick Model came and immediately followed by the central dogma, which could aid in the cracking of the genetic material, this helped the geneticists to know that DNA of a chromosome was a single molecule. It is quite interesting to note that the DNA is a single molecule despite the fact that it posses the ability quite a large amount of information as demanded by the highly complex gene. The DNA molecule is as well quite long. The inventions realized in past period could not be practiced instantly until another third of the century in 1985 when the tools of forensics were applied hence a new dawn identified in for law enforcement through forensics, this propelled the FBI to start using DNA id the year 1998 (Gilmore, Peakall, amp. Robertson, 2003).