Vaccine for small pox was developed by

A distinct mechanism that usually involves a short segment of $DNA$ with remarkable capacity to move from one location in a chromosome to another, this is called

Insect resistant transgenic cotton has been produced by inserting a piece of $DNA$ from

Palaeontologists unearthed a human skull during excavation. A small fragment of the scalp tissue was still attached to it. Only little $DNA$ could be extracted from it. If the genes of the ancient man need to be analysed, the best way of getting sufficient amount of $DNA$ from this extract is

Human insulin is being commercially produced from a transgenic species of