What are the materials of which chromosomes are made condenses during prophase?

Chromosomes are primarily made up of DNA and proteins, specifically histones. During prophase of cell division, the chromatin (a loose form of DNA) condenses into tightly packed chromosomes, allowing for easier segregation during mitosis or meiOSis. This condensation is facilitated by the wrapping of DNA around histone proteins, forming nucleosomes, which further coil and compact to create the visible chromosome structure.