The cell is the building block of living things. Our bodies are made up of millions of cells. Inside each cell, in a special compartment called the nucleus, is a set of packages called chromosomes. Chromosomes contain thousands of genes, the recipes for all the chemicals that our cells need to grow and stay healthy.
Genes also determine features like eye color, height, and hair color.
We inherit our genes from our parents. This is why children resemble their parents. There are 46 total chromosomes in each cell. They come in 23 pairs, numbered by size. We have a pair of chromosome number ones, a pair of number twos, and so on.