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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.
44. - - -. In humans, there are 23 chromosomes in one set. Of these, one is a sex chromosome, and the other 22 are autosomes. So there are 22 autosomes in a human gamete (spermatozoon or ovum). In the zygote and all the body cells subsequently formed from the zygote, there are two sets (the diploid condition) and therefore 44 autosomes (two genetically different versions of each of the 22).