Since the existence of mankind, people tried to purify humans to create the perfect race. It was a popular movement and gained great popularity during the 20th century but later died down. Animals were bred to benefit specific human needs. A German Shepard, for example, to help shepherds herd their cattle. Also livestock and crops are modified to benefit farmers by generating more profit. With modern technological advancements, people are able to change the gene
structure of animals and plants without having the struggle of finding the correct mate for reproduction purposes. However, as the technology advanced, it began to inspire scientist to create this technology available for humans
. This raises an ethical question of whether self-direction of human development should or should not be allowed.