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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.
Homologous chromosomes are two identical chromosomes of a pair having same centromere location, gene position, size, shape and length....infact they are exactly same.Homologous pairs occur in diploid cells.For example human cell has 46 chromosomes or 23 homologous pairs. A pair is a set of two, as we know it. In each homologous pair one chromosome is from mother and the other is from father, thus we conclude that in a diploid human cell 23 chromosomes are from father and 23 chromosomes are from mother and collectively they form 23 pairs.