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Best Answer: unduplicated chromosomes are single linear strands, whereas duplicated chromosomes (copied during synthesis phase) contain two copies joined by a centromere.(centromere is a region of DNA t found near the middle of a chromosome where two identical sister chromatids come in contact).
A chromosome (chromo- + -some) is a packaged and organized structure containing most of the DNA of a living organism.ccurring only in the nucleus of eukaryotic cells, chromatin composes the vast majority of all DNA, except for a small amount inherited maternally which is found in mitochondria. In prokaryotic cells, chromatin occurs free-floating in cytoplasm, as these cells lack organelles and a defined nucleus.