How many centromeres are there if there are 20 chromatids in a cell?

The correct answer to this question is Centromeres. Centromeres are the region of a chromosome where the microtubules of the spindle attach during cell division. Centromeres are at the end of the chromatid where two replicated sister chromatids are attached.

Centromeres only appears when DNA replication occurs. The normal number of chromosomes in the cell is 10, and there are normally 5 chromosome pairs. With 20 chromatids, there would be 2 identical pairs (sister chromatids) after they have gone through replication. So there would be 10 centromeres, because you would divide the 20 chromatids in half to get the 10 centromeres.