Mammoths frozen in ice can still have preserved DNA in their cells. In fact, the whole mammoth genome has been sequenced from frozen specimens. Some scientists want to bring mammoths back from extinction. These scientists propose to start with Asian elephant DNA. Next, they will insert mammoth DNA sequences. Finally, they will put the DNA into an elephant egg and implant it into a female elephant. If all goes well, the mother elephant will give birth to a very mammoth-like baby. Which genetic technology involves mixing the DNA of two or more species?