Well, it's an ethics question really. There are no real physical disadvantages. (Unless you engineer everyone to be the same, then we can't evolve and become dependant on cloning and genetic engineering to be able to breed and stay one step ahead of viruses)
There are alot of disadvantages...like people can make clones without heads so they couldn't breathe, people can make them smater, more athletic, and sexier than normal people. Everyone will soon be the same and there will be no job oppertunites because anyone will be just like everyone else. Some scientists even think that the clones will age quicker too. Plus Genetic Engineering is against God's will, it's unnantural, and it crosses the species barrier.
Tuiteman says that some disadvantages are opinional.
genetic engineering
Genetic engineering can cause side affects unknown to humans. And it is messing with nature and the way of human life
The ability to defy gravity is one ability that has not been brought about by genetic engineering. There are many others. Free chocolate for everyone is another.interferon
it would enable humans to live forever
genetic engineering, chemical engineering, biology
Short Answer is: our understanding of genetic engineering.
the risks and benefits of genetic engineering.
what made genetic engineering possible
lactobacillus converts milk to curd and E.coli for genetic engineering hope this was helpful
Genetic Engineering.
an example of genetic engineering are like: Cloning IVF