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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.
During cell division, the identical copies (called a  sister chromatid pair ) are joined at the region called the centromere (2). Once the paired sister chromatids have separated from one another (in the anaphase of mitosis) each is known as a daughter chromosome.The short arm of the left chromatid (3), and the long arm of the right chromatid (4), are also marked.A chromatid (Greek khrÅmat- 'color' + -id) is one copy of a newly replicated chromosome, which typically is joined to the other copy by a single centromere.Before replication, one chromosome is composed of one DNA (double-helix) molecule.he short arm of the left chromatid (3), and the long arm of the right chromatid (4), are also marked. A chromatid (Greek khrÅmat- 'color' + -id) is one copy of a newly replicated chromosome, which typically is joined to the other copy by a single centromere.