Genetic engineering allows scientists to directly modify an organism's genes to enhance traits. Examples include crops with increased pest resistance or modified oil content. Cloning organisms is also possible by splitting an early embryo into cells or transferring a cell nucleus into an unfertilized egg. Mutations in human genes occur naturally and can be inherited, unlike artificial changes through genetic engineering. Recombinant DNA techniques have been used to create bacteria that produce human insulin, growth hormone, and vaccines. Dolly the sheep was the first mammal cloned from an adult cell, providing evidence that somatic cell nuclear transfer can recreate a whole organism. While genetic engineering has benefits like curing diseases, some argue it is unethical and should be banned due to