-why does chromosomes wound up structures of dna ?

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Chromosomes do not exactly wind up structures of DNA. Chromosomes are molecules of DNA that are wound up around histones (proteins); as a result, it is visible in the microscope. DNA are packaged into chromosomes for cell division. They need to be packaged so that the DNA information is organized in a structure that the cell can split and transport around the cytoplasm easily without losing information. Each chromosome also holds certain information. For example, one chromosome has one section (forgot what that specific parts called) that holds the DNA coding for skin pigments or hair color, etc. That way during cell division, the cell can ensure that the equal information is distributed to the daughter cells when the sister chromatids split during anaphase into separate chromosomes.