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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.
REPLICATED HOMOLOGOUS PAIR OF CHROMOSOMES: A homologous pair of chromosomes after DNA replication. _____ CHROMATID: The equivalent of a non-replicated chromosome AFTER DNA replication. SISTER CHROMATIDS: 2 identical chromatids which are bound together by a centromere. Only exists after DNA replication. Sister chromatids are collectively known as a replicated chromosome. _____ 2n chromosomes = n homologous pairs of chromosomes _____ Before DNA replication, a body cell has 2n non-replicated chromosomes = n non-replicated homologous pairs of chromosomes After DNA replication, a body cell has 2n replicated chromosomes = n replicated homologous pairs of chromosomes.