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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.
Someone did infact post the correct answer. The correct answer is that there are 92 chromosomes before meiosis, and after, there are 23 chromosomes in each sex cell produced. Before meiosis the ploidy is 2n and each chromosome is duplicated.The diploid number of humans is 46, and since the chromosomes are duplicated (doubled), the total number of chromosomes is 92. The ploidy of the sex cells produced is n, (haploid, which is 23 in humans) so there are 23 chromosomes per sex cell produced.omeone did infact post the correct answer. The correct answer is that there are 92 chromosomes before meiosis, and after, there are 23 chromosomes in each sex cell produced. Before meiosis the ploidy is 2n and each chromosome is duplicated.