The transgenic animals are those which have

Options

A. foreign DNA in some of its cells
B. foreign DNA in all its cells
C. foreign RNA in al its cells
D. DNA ad RNA both in the cells

Explanation

**Step-by-Step Solution:**

1. **Understanding Transgenic Animals**: Transgenic animals are organisms that have had a foreign gene deliberately inserted into their genome. This is done to study gene function and regulation, produce proteins for pharmaceuticals, or enhance certain traits.

2. **Definition of Foreign DNA**: Foreign DNA refers to genetic material that originates from a different species. This DNA can be introduced into the animal's cells through various techniques, such as recombinant DNA technology.

3. **Insertion of Foreign Genes**: The process of creating transgenic animals involves inserting foreign genes into the animal's genome. This can be accomplished through methods like microinjection, viral vectors, or electroporation.

4. **Presence of Foreign DNA**: Once the foreign DNA is successfully integrated, it becomes part of the animal's genetic material. This means that the transgenic animal will express the traits or characteristics associated with the introduced gene.

5. **Conclusion**: Therefore, transgenic animals can be defined as those that contain foreign DNA in all their cells, which allows them to exhibit specific traits or produce certain substances.

**Final Answer**: Transgenic animals are those which have foreign DNA in all their cells.

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