Mark the incorrect statement.

Specific Bt toxin genes were isolated from Bacillus thuringiensis and incorporated into the several crop plants such as cotton.

RNAi takes place in all eukaryotic organisms as a method of cellular defense.

Gene therapy is a collection of methods that allows correction of gene defect that has been diagnosed in a child/embryo.

Human protein ($\mathrm{\alpha }$-1-antitrypsin) is a biological product obtained from transgenic animal to make milk nutritionally well balanced.