A transgenic animal is defined as:
1
An animal which has foreign DNA and RNA in some of its cells because of an injection of DNA and RNA into the nucleus of the zygote from which it is developed
2
An animal which has foreign DNA in all its cells because of an injection of DNA into the nucleus of the zygote from which it is developed
3
An animal which has foreign DNA in some of its cells because of an injection of DNA into the nuclei of some of the cells of the blastocyst
4
An animal which has foreign DNA in all its cells because of an injection of DNA into the nuclei of some of the cells in adulthood