"Chromosomes are like threads inside of cells. They carry series of genes. In the 1880s, Walter. Sutton and Theodor Boveri discovered what chromosomes are ..." kinda like thread that has been curled around it self so it be compact and fit inside a cell...
Feel free to be the first
Please review the linked page for context.
If you can think of something better than this,
please add it to the database