Here's a breakdown:

* DNA is a long molecule made up of two strands twisted around each other in a double helix shape.

* These strands are made of building blocks called nucleotides, which have three parts:

* A sugar molecule (deoxyribose)

* A phosphate group

* A nitrogenous base (adenine, guanine, cytosine, or thymine)

* The order of these bases along the DNA strand is what makes up the genetic code.

* Genes are specific segments of DNA that contain the instructions for building and maintaining an organism.

* Each gene has a unique sequence of bases, which determines the specific protein it codes for.

* These proteins carry out a wide range of functions in the body, from building tissues and organs to regulating metabolism and immunity.

So, to answer your question directly: Genes are made up of DNA, which is made up of nucleotides.