Genes joined together don't make a single thing, but rather contribute to the formation of a chromosome.

Here's a breakdown:

* Genes: Genes are segments of DNA that contain the instructions for building and maintaining an organism. They are like individual recipes in a cookbook.

* Chromosomes: Chromosomes are long, thread-like structures made up of tightly coiled DNA. They act like the entire cookbook, holding many genes together.

* Joining Genes: Genes are linked together in a specific order on a chromosome. This order is important because it helps determine how genes are expressed (turned on or off) and how they interact with each other.

In summary: Genes are the building blocks of chromosomes, and chromosomes contain all the genetic information needed to build and maintain an organism.