American student, David - not his real name - explains why he chooses to buy illegal drugs on the so-called 'dark web'. You don't have to go in front of a street dealer, where there might be a risk of violence, he adds. And it is not just drugs which are available on this online black market. Fake passports, guns - even child pornography.
Genetic material is that substance which not only controls the inheritance of traits from one generation to the next but is also able to express its effect through the formation and functioning of the traits. Components of genetic material which control characters are called genes. Genes are located over chromosomes. In sexually reproducing organisms, an indiÂ­vidual receives one genome or one set of chromosomes (and hence genes) from male parent and a second genome or set of chromosomes from female parent.
DNA is the main hereditary material in prokaryotes , eukaryotes and in viruses too.DNA on replication forms exact copy of itself.The DNA passes genetic information from one generation to the next one.The DNA carries genes for various expression.The DNA replication also help in the survival of that particular organism in the world.Hence DNA replication is a necessary process. If DNA is mutated in such process then the mutation may cause drastic changes in the organism.