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10.1C: Eukaryotic Chromosomal Structure and Compaction Eukaryotic Chromosomal Structure and Compaction. If the DNA from all 46 chromosomes in a human cell nucleus was laid out end to end, it would measure approximately two meters. However, the diameter would be only 2 nm. Considering that the size of a typical human cell is about 10 µm (100,000 cells lined up to equal one meter), DNA must be ... Chromatid - Genome.gov The two "sister" chromatids are joined at a constricted region of the chromosome called the centromere. During cell division, spindle fibers attach to the centromere and pull each of the sister chromatids to opposite sides of the cell. Soon after, the cell divides in two, resulting in daughter cells with identical DNA. Narration 00:00 … Chromatid. 6 Main Parts of a Chromosome - Biology Discussion The following points highlight the six main parts of a chromosome. The parts are: 1. Pellicle and Matrix 2. Chromatids, Chromonema and Chromomeres 3. Centro...