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The answer is 20. Duplicated chromosome has two sister chromatids, identical copies of the chromosome. These two chromatids are joined at the region called centromere. Therefore, one duplicated chromosome has one centromere and two sister chromatids. If there are 20 duplicated chromosomes in a cell, there will be 20 centromeres.
Homologs are chromosomes (chromosomes are two chromatids joined by a centromere). in diploid cells, there are pairs of homologs called homologous chromosomes--two chromosomes â¦that are essentially the same. when they pair, the chromatids that look the same are called sister chromatids. hope this helps.