If a transgene is inserted into an animal embryo

only the non-reproductive cells should contain the transgene DNA.

the animal should become sterile as an adult.

every cell should contain the transgene DNA.

the transgene protein will be expressed in all cells.

only the sperm and egg cells should contain the transgene DNA.

Every cell should contain the transgene DNA.

Explanation:

The embryo is the very early stages of growth and development of an organism. An embryo develops from a zygote and contains about 16 cells. Inserting transgenes in these cells, therefore, will ensure that all the cells that divide from the embryo by mitosis have the transgene. The whole organism will, therefore, bear the transgene including its gametes. This foreign gene will, therefore, be inherited by the offspring of the organism.