The cell part that contains genetic material and controls functions is the nucleus.

Here's why:

* Genetic Material: The nucleus houses the cell's DNA, which contains the instructions for building and maintaining the entire organism.

* Control Center: The nucleus directs the cell's activities by controlling the production of proteins, which are essential for all cellular processes. It does this by regulating the transcription of genes within the DNA.

Let me know if you have any other questions about cell parts!