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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).
Noun. 1. chromosome-a threadlike strand of DNA in the cell nucleus that carries the genes in a linear order; humans have 22 chromosome pairs plus two sex chromosomes. cell nucleus, karyon, nucleus-a part of the cell containing DNA and RNA and responsible for growth and reproduction.hromosome. 1. A coiled thread of DNA found in the nucleus of a cell. 2. A rodlike body containing genes, and appearing in a cell nucleus as the cell divides.