This video lecture from Variation and Genetics (F.Sc. second year Biology) covers introduction about Drosophila melanogaster and T. H. Morgans Experiments on white eye and red eye fly to confirm the sex linkage in fruit fly. 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.