True/False - predict whether each statement is true or false.
1 - Cloning occurs in nature as well as in a laboratory.
2 - Nuclear transfer involves replacing the nucleus of a fertilized egg with the nucleus of a cell from the animal that is being cloned.
3 - Dolly the sheep was the first mammal cloned from an embryonic cell.
4 - HeLa cells stop dividing after five divisions.
5 - It is a benefit in cystic fibrosis to use gene therapy to introduce a copy of the gene into the cell that produces a normal functioning protein.
6 - There is no risk for herbicide-resistant crops to receive genes for resistance to the herbicide.