Here's a breakdown:

* Chromosomes: These are long, thread-like structures found in the nucleus of every cell. They are made up of DNA (deoxyribonucleic acid).

* Genes: These are segments of DNA that contain the instructions for building and maintaining an organism. They code for specific traits, like eye color or height.

Imagine a chromosome as a long string of beads. Each bead represents a gene. These genes are arranged in a specific order along the chromosome.

Here are a few additional points:

* Many Genes: A single chromosome can contain thousands of genes.

* Linear Arrangement: Genes are arranged linearly along the chromosome, like beads on a string.

* Organization: The genes on a chromosome work together to regulate various biological processes within a cell.

So, you are correct in saying that chromosomes are made up of many genes joined together. It's a fundamental concept in genetics!