The news that researchers have used cloning to make human embryos for the purpose of producing stem cells may have some people wondering if it would ever be possible to clone a person.
Although it would be unethical, experts say it is likely biologically possible to clone a human being.
Problems with imprinting can result in extremely large placentas, which ultimately leads to problems with blood flow for the fetus, Lanza said. In one experiment, Lanza and colleagues cloned a species of cattle called banteng, and it was born at twice the size of a normal banteng. It had to be euthanized, Lanza said.
The extremely high rate of death, and the risk of developmental abnormities from cloning makes cloning people unethical