2.1.8 Explain that cells in multicellular organisms differentiate to carry out specialized functions by expressing some of their genes but not others.

Every cell in a multicellular organism contains all the genes of that organism. However, different genes are activated depending on the cell. This is why we different cells make up different parts of our body. Cells can develop in different ways, which is called differentiation. Differentiation depends on gene expression which is regulated mostly during transcription. It is an advantage for multicellular organisms as cells can differentiate to be more efficient. On the other hand, unicellular organisms have to carry out all of the functions within one cell.