What is the primary purpose of the chromosomes in a cells nucleus?

They are made of protein and one molecule of deoxyribonucleic acid (DNA). As the genetic material passes from parents to child, the chromosomes are responsible for containing the instructions that make the offspring unique while still carrying traits from the parent.

Chromosomes are crucial in replication and dividing to create a new cell.

Explanation:

Chromosomes store DNA. They're responsible for replicating that DNA when it's time to divide. They're also responsible for contracting and retracting during mitosis so each new cell can receive DNA.