This video lecture from Chromosomes and DNA (F.Sc. second year Biology) covers details discussion of DNA replication models i.e. different models of DNA replications and experiment of Meselson and Stahl for semiconservative model of DNA replication. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.